Except there is a lot more going on that we can't see than people realise. I don't need to hear someone speak to know if they are ' enlightened ' or not ;)
Omg I came here for my psycholinguistics homework two videos ago and I just can't stop watching you! I loved so much the review at the end. What a great teacher! This BA Mexican student is sooo happy!
I have no words for the way u are presenting the topic for us. Pls keep making such videos with animations and images. Also try to make some videos related to the IIT-JEE prep, I would love it.
I’m very disappointed, there was so much room for a light 💡 dad joke somewhere in there haha. Awesome vid again, Thanks Prof Dave! Science is addictive, or my ocd has nothing else to focus. Either way I’m enjoying learning, bit by bit. They way it’s all sectioned out makes your page extremely easy to reference. Explain it to me like I’m 4yrs old and we are all good. Love it haha 😂
This is the best explanation that I have seen or heard. Electro magnetic is good but energy frequency will also cover sound. What is light? Light to us is an electromagnetic energy frequency that most living beings translate into what we perceive as light. All other energy frequencies are darkness to us. If Earth has the only living beings in the Universe and our Sun went supernova extinguishing all life, would the universe be light or dark?
@@dabmaster1233 it's not about the star, it's about living beings that can translate an energy frequency into what we know as light. The universe would be dark. Dumbass!
@@ProfessorDaveExplains Is there a historical reason for nu instead of f to represent frequency of light, when lowercase f would seem more logical? The letter nu seems like it has no connection to the word frequency.
Jean-Paul Teitu II where is your proof of this? You most likely have never met his mother nor has this person met you, so neither of you can objectively call the other stupid with no basis
Okay. I will rephrase it then. How could not see that this was posted a long time before the quarantine, it’s right at the top. My point is how quickly do you read over things that you don’t even pay attention to the big parts. And don’t even try to insult my mom.
Way to go Dave! Started watching your videos even when not studying! And damn you hit me with a quiz at the end (really good idea actually!). Will support you $ when out of grad school (lol)! Can't wait for next one!
Professor Dave Explains omg he replied 🤩 lol ok so I’ll cite any textbook I use. your vids are just so I can understand what’s being said in the textbook. Got it. Thank you!!!
But how do we actually see the light? How does my screen work etc? Great video but I just ant understand it, need to watch a deeper dive on why and how we actually see the visible light and colours and where it comes from etc.
This was the perfect explanation. I am just really disappointed that I cannot use the video for my eighth graders due to the anatomically correct illustration of humans. 😢
This is so good ! Light or electric magnetic wave is a wave of oscillating electric and magnetic fields perpendicular to each other and the dire tion of their propogation... Wow that animation was awesome 💯 explained everything
There probably isn't an upper limit on the EM spectrum, and more intensely energetic waves are probably possible, they would probably have to be created artificially.
THANKS! this was to the point and very comprehendable. one doubt though, why is is that electromagnetic radiations are not deflected by electrical and magetic feilds ?
If different wavelengths means different colours, than why colour do not change with refraction where the wavelengths change and become shorter? Thanks in advance
And so, wavelength determines color while amplitude determines chroma? Extreme Amplitude is bounded between black and white, All color to no color? Or is it, max visible amplitude results in highest color intensity and the energy level either goes to white light ( high energy) or no light ( low energy).
Yes, we can find polarized EM radiation of all kinds, either manmade or natural. Since EM waves are transverse, all of them have a polarization. And a group of them could either have an organized polarization, or a mass assortment of polarization that we'd call unpolarized. Some examples: UV is naturally polarized as it fills our blue sky background. AM radio is linearly polarized vertically by the working principles of the antenna orientation, while FM radio is intentionally polarized with a circular polarization to improve reception on any receiver's antenna orientation.
Hi Dave. I love your videos...very informative. Question - I read that a photon has no mass. Does that pertain only to a 'resting' photon, and they gain mass only when moving (which they essentially always do or we wouldn't see anything)? If a photon has no mass, and gravity affects objects with mass, how does a black hole attract photons so strongly they can't escape? wouldn't they be unaffected if they are massless? It may be a stupid q, but I'm no physicist so figured you might could help me out with this one...thanks!
Always massless, so with black holes it's about the warping of spacetime, check out my modern physics playlist for more info! The general relativity tutorial in particular. And then also my astronomy playlist for more on black holes.
@@ProfessorDaveExplains Right, I get the warping of spacetime (well mostly) but I figured that is what's happening in a gravitational field anywhere...meaning that I thought the key component to gravity (warping of spacetime) manipulating anything was that whatever that thing is it has to have mass. I've always thought of matter according to its traditional scientific definition: anything that has mass and takes up space. Gravity (warping of spacetime) attracts matter b/c matter has mass. A photon has no mass and essentially doesn't take up space, it isn't really 'matter' by definition, or is it? To me it suggests that gravity is simply one component / 'side effect' of the warping of spacetime, meaning the warping of spacetime and gravity are NOT exactly the same thing. i.e. there is more to the warping of spacetime than it just creating a gravitational field - it's does more than that I'll check out the videos you mentioned. I think I saw one or two on black holes already.
@@ProfessorDaveExplains Understood, my confusion lies in that even though the black hole has mass, doesn't anything it attracts have to have mass also? Or is it not required for BOTH objects to have mass?
What if matter is just more of the electromagnetic spectrum but after protons have gained more mass by attracting an electron but still part of that spectrum?
Do we know absolutely that there is no more to the spectrum, or have we just not discovered any new way to record what may be beyond? Stupid question. I know but how can we test it or find a way to test it? Good use of Horus BTW.
Lightning and thunder in fact occur at the same time, but the reason we human see the light before hearing the sound of thunder just simply because our eyes are ahead of our ears....
2:18 Why does all elctromagnetic radiation have the same speed,I mean they should have different speeds because they have differemt frequencues. "A wave having more frequency travells slower than that of a low frequency wave". Pls explain this🙏🙏🙏🙏
Hi, I’m very confused. Why some say “light particle doesn’t has neutral charge”, when is supposed to be the same exact thing. If I compare transmittion of electric waves over copper vs light over (well, inside) optic fiber, I can catch that maybe because of wavelenght another conductor is needed. But there are other reactions that are different, looks like light can’t give you a shock, but electricity certainly can. Thnx in advance!
Q: Lightspeed is constant in water and in glass and in vacuum, so why not also in Earth’s atmosphere? And: As lightspeed in Earth atmosphere is constant also when the lightsource is changing velocity, that should be different for observers when changing velocity? Or not?
the speed of light is always constant, it just can take light more or less time to travel through different substances because it has to interact with the atoms it contains in order to do so, and that can change the path of the light, so i believe the density of the substance is a factor.
Does EM waves present everywhere as full range with all types of waves? If an object absorb some visible light what does it mean? Does it mean that visible spectrum only incident the object and some Wavelengths are absorbed and some reflected?Or EM wave with full range hit that object first , and object absorbs only visible light ?
Wasn't the speed of light in a vaccum was 300,000 m/s? If the speed was 300,000,000 m/s it would only take 30 milliseconds for the sunlight to reach Earth, but as a widely believed fact, it takes 8 minutes and 17 seconds to happen that. Also, as you stated that it takes around a second for light/any electromagnetic wave to travel to the moon, and by considering that moon is around 380,000 meters from earth, it again works out to around 300,000 m/s.
I’m not sure if my comment is still here but what’s your take on the deconstructive interference at a photo detector that makes it look like there is no energy at that spot in time but the next plank length forward or back the two photons would have been observed 🧐 dark matter and energy?
“Light travels faster than sound. This is why some people appear bright until you hear them speak.”
No, it such mere deceptions can't be measured by naked eyes.
XD
Oh my God🤣🤣
Wise words.
Except there is a lot more going on that we can't see than people realise. I don't need to hear someone speak to know if they are ' enlightened ' or not ;)
I lowkey was waiting for him to say, OK, let me shed some light on this subject
Science Revolution what the fuuuuuu
@Science Revolution Dude thats an amazing explanation thank you
wasted opportunity xD
@Science Revolution we call this "dumb assery"
I’ll never know what science revolution said. My life will never be complete
Omg I came here for my psycholinguistics homework two videos ago and I just can't stop watching you! I loved so much the review at the end. What a great teacher! This BA Mexican student is sooo happy!
explained in 4 mins what my lecturer failed to explain in 40 mins
Bro shut up with these comments 😊
I have no words for the way u are presenting the topic for us. Pls keep making such videos with animations and images. Also try to make some videos related to the IIT-JEE prep, I would love it.
All my life I've only ever been on the Autism Spectrum, so this is a very helpful video, thanks
u have ur own aesthetic of a science teacher thats actually cool
I’m very disappointed, there was so much room for a light 💡 dad joke somewhere in there haha.
Awesome vid again, Thanks Prof Dave! Science is addictive, or my ocd has nothing else to focus. Either way I’m enjoying learning, bit by bit.
They way it’s all sectioned out makes your page extremely easy to reference.
Explain it to me like I’m 4yrs old and we are all good. Love it haha 😂
That was the best intro ever
Yaa😆😆
That's an introductory intro.
Hi
In chemistry/physics jesus we trust 🤞
this is so funny 😭
Bad news travel faster than than the speed of light.
What is Light? Baby don't hurt me, don't hurt me, no more.
You are the best UA-camr and science educator, well all fields, educator.
Reality is so weird.
Exactly
Agree
Best explanation 👍
Thank you this helped a lot🙏😭
Good Explanation
Your explaination is owsem🎉🎉 keep it up
(I) Electromagnetic waves
(ii) Electric field & Magnetic fields
(iii)3*10^8 m/s
I find your videos really good to watch
I like the question part in the ending
Me too
Good presentation
Not gonna lie when my teacher for general science all I could think of was how much Dave looks like *jEsUs*
Not at all
At least I do not think so
Y’all Jesus was black or at least I think so. The bible didn’t mention his color
This is the best explanation that I have seen or heard. Electro magnetic is good but energy frequency will also cover sound.
What is light?
Light to us is an electromagnetic energy frequency that most living beings translate into what we perceive as light. All other energy frequencies are darkness to us.
If Earth has the only living beings in the Universe and our Sun went supernova extinguishing all life, would the universe be light or dark?
Fat Unicorn other stars dumbass
@@dabmaster1233 it's not about the star, it's about living beings that can translate an energy frequency into what we know as light. The universe would be dark.
Dumbass!
At 2:38, I believe the formula should be c=λf
same thing
@@ProfessorDaveExplains Is there a historical reason for nu instead of f to represent frequency of light, when lowercase f would seem more logical? The letter nu seems like it has no connection to the word frequency.
f is frequency and v is also denoted for frequency as its a greek symbol nu
My physics teacher showed us this 😂😂
Jean-Paul Teitu II, how stupid are you?That comment was from a year ago.
Jean-Paul Teitu II where is your proof of this? You most likely have never met his mother nor has this person met you, so neither of you can objectively call the other stupid with no basis
Okay. I will rephrase it then. How could not see that this was posted a long time before the quarantine, it’s right at the top. My point is how quickly do you read over things that you don’t even pay attention to the big parts. And don’t even try to insult my mom.
@Jean-Paul Teitu II wow I have never seen such rare specimen of ape-human hybrid tell me good sir do you have a brain?
Jean-Paul Teitu II you fucking edited it don’t even give me that shit
Way to go Dave! Started watching your videos even when not studying! And damn you hit me with a quiz at the end (really good idea actually!). Will support you $ when out of grad school (lol)! Can't wait for next one!
future money is almost as good as now money! and leisure watching is good too :)
This is exactly what i was looking for
Good stuff man. I love the quick mask cutouts!
I wish professor Dave would cite his sources in his youtube vids :,( i always use his vids to write essays for my science classes
i usually just work directly out of a textbook! and i find them all the be rather similar
Professor Dave Explains omg he replied 🤩 lol ok so I’ll cite any textbook I use. your vids are just so I can understand what’s being said in the textbook. Got it. Thank you!!!
here studying the electromagnetic spectrum looking for a connection to consciousness and and all this is connected to the phenomenon
wtf is that intro lol its AMAZING
very nice
Very informative vids. Keep it up buddy lol👍🏾
Watching this enlightened me..😁
Thank you sir this helped a lot.
NICE VIDEO
Super amazing video
thanks it helped a lot
David you are awesome!!!
Hi this is a very awesome video. Can we use it for our thesis project?
go for it!
Thank you so much!
Ask the person for money Dave!!
The intro made me subscribe
I prefer listening to this than our 3 hour lecture lol
But how do we actually see the light? How does my screen work etc? Great video but I just ant understand it, need to watch a deeper dive on why and how we actually see the visible light and colours and where it comes from etc.
I remember watching this forever ago for gen chem and now I'm taking ochem 2 I need to review it so I can figure out spectroscopy
Very nice video, helped a lot
Nice video, thanks :)
Love these videos. Thank you
Nice explanation sir.... Wow amazing 👌❤️❤️💞👌
This was the perfect explanation. I am just really disappointed that I cannot use the video for my eighth graders due to the anatomically correct illustration of humans. 😢
This is so good ! Light or electric magnetic wave is a wave of oscillating electric and magnetic fields perpendicular to each other and the dire tion of their propogation... Wow that animation was awesome 💯 explained everything
Sir can you make a video on
Emission adsorption spectra
i cover that a bit in the bohr model, i talk about it a bit in the astronomy series with the spectral classification of stars
Thanks professor
I am taking a college level physics, I was told double transverse waves travel through a vacuum at 186,282 miles/s
ya but in the video he said kilo meters
There probably isn't an upper limit on the EM spectrum, and more intensely energetic waves are probably possible, they would probably have to be created artificially.
Love this❤️💖
Thank you so much, you have no idea.
My teacher linked this vid ;-;
We have to do a poster about 1 of the 7 electromagnetic waves, I choose ultraviolet.
Thanks Professor Dave!
Please provide me the link of how electromagnetic feild is produced
Thank you sir❤
thanks prof
THANKS! this was to the point and very comprehendable.
one doubt though, why is is that electromagnetic radiations are not deflected by electrical and magetic feilds ?
@MatthewPhilip-d6z i guess yeah it is
1:11
*I am confused that why people represent the wave like the above one instead of the below one which is real ?*
1:18 “What is a kind, Kent?”
thank you sir
If different wavelengths means different colours, than why colour do not change with refraction where the wavelengths change and become shorter? Thanks in advance
Harmonics . Ratio . ?
That is the greatest theme song ever. Billy nye just got schooled on theme songs
And so, wavelength determines color while amplitude determines chroma? Extreme Amplitude is bounded between black and white, All color to no color? Or is it, max visible amplitude results in highest color intensity and the energy level either goes to white light ( high energy) or no light ( low energy).
Are all wavelengths in the electromagnetic spectrum polarizable as with visible light? Thx
Yes, we can find polarized EM radiation of all kinds, either manmade or natural. Since EM waves are transverse, all of them have a polarization. And a group of them could either have an organized polarization, or a mass assortment of polarization that we'd call unpolarized.
Some examples:
UV is naturally polarized as it fills our blue sky background.
AM radio is linearly polarized vertically by the working principles of the antenna orientation, while FM radio is intentionally polarized with a circular polarization to improve reception on any receiver's antenna orientation.
good video
Thanks
What is the nature of the electromagnetic field?
Hi Dave. I love your videos...very informative. Question - I read that a photon has no mass. Does that pertain only to a 'resting' photon, and they gain mass only when moving (which they essentially always do or we wouldn't see anything)? If a photon has no mass, and gravity affects objects with mass, how does a black hole attract photons so strongly they can't escape? wouldn't they be unaffected if they are massless? It may be a stupid q, but I'm no physicist so figured you might could help me out with this one...thanks!
Always massless, so with black holes it's about the warping of spacetime, check out my modern physics playlist for more info! The general relativity tutorial in particular. And then also my astronomy playlist for more on black holes.
@@ProfessorDaveExplains Right, I get the warping of spacetime (well mostly) but I figured that is what's happening in a gravitational field anywhere...meaning that I thought the key component to gravity (warping of spacetime) manipulating anything was that whatever that thing is it has to have mass. I've always thought of matter according to its traditional scientific definition: anything that has mass and takes up space. Gravity (warping of spacetime) attracts matter b/c matter has mass. A photon has no mass and essentially doesn't take up space, it isn't really 'matter' by definition, or is it?
To me it suggests that gravity is simply one component / 'side effect' of the warping of spacetime, meaning the warping of spacetime and gravity are NOT exactly the same thing. i.e. there is more to the warping of spacetime than it just creating a gravitational field - it's does more than that I'll check out the videos you mentioned. I think I saw one or two on black holes already.
The black hole is the thing doing the warping, black holes have mass.
@@ProfessorDaveExplains Understood, my confusion lies in that even though the black hole has mass, doesn't anything it attracts have to have mass also? Or is it not required for BOTH objects to have mass?
it's just that the black hole warps spacetime so immensely that the escape velocity exceeds the speed of light, it's all in the astronomy playlist
So I was at class writing about how chameleons change their color and now I'm spending recess learning about electromagnetic radiation
Best stuff ever😉
Thank u sir,
0:08 subbed.
What if matter is just more of the electromagnetic spectrum but after protons have gained more mass by attracting an electron but still part of that spectrum?
I love your backgrounds
Do a playlist on Inorganic chemistry
what an intro!
Maxwell actually wrote about the invention the faraday
Do we know absolutely that there is no more to the spectrum, or have we just not discovered any new way to record what may be beyond? Stupid question. I know but how can we test it or find a way to test it? Good use of Horus BTW.
Can you explain how the wave nature of light causes refraction of light?
symbol and unit write as m. #notes
delicate symbol. #who
Lightning and thunder in fact occur at the same time, but the reason we human see the light before hearing the sound of thunder just simply because our eyes are ahead of our ears....
prof dave thank you iloveyoooooou
2:18
Why does all elctromagnetic radiation have the same speed,I mean they should have different speeds because they have differemt frequencues.
"A wave having more frequency travells slower than that of a low frequency wave". Pls explain this🙏🙏🙏🙏
frequency is about number of wave cycles per unit time, all EM radiation still travels at the speed of light
Hi, I’m very confused. Why some say “light particle doesn’t has neutral charge”, when is supposed to be the same exact thing. If I compare transmittion of electric waves over copper vs light over (well, inside) optic fiber, I can catch that maybe because of wavelenght another conductor is needed. But there are other reactions that are different, looks like light can’t give you a shock, but electricity certainly can. Thnx in advance!
Q: Lightspeed is constant in water and in glass and in vacuum, so why not also in Earth’s atmosphere?
And: As lightspeed in Earth atmosphere is constant also when the lightsource is changing velocity,
that should be different for observers when changing velocity?
Or not?
the speed of light is always constant, it just can take light more or less time to travel through different substances because it has to interact with the atoms it contains in order to do so, and that can change the path of the light, so i believe the density of the substance is a factor.
wow
ulol
Does EM waves present everywhere as full range with all types of waves? If an object absorb some visible light what does it mean? Does it mean that visible spectrum only incident the object and some Wavelengths are absorbed and some reflected?Or EM wave with full range hit that object first , and object absorbs only visible light ?
Wasn't the speed of light in a vaccum was 300,000 m/s? If the speed was 300,000,000 m/s it would only take 30 milliseconds for the sunlight to reach Earth, but as a widely believed fact, it takes 8 minutes and 17 seconds to happen that. Also, as you stated that it takes around a second for light/any electromagnetic wave to travel to the moon, and by considering that moon is around 380,000 meters from earth, it again works out to around 300,000 m/s.
I’m not sure if my comment is still here but what’s your take on the deconstructive interference at a photo detector that makes it look like there is no energy at that spot in time but the next plank length forward or back the two photons would have been observed 🧐 dark matter and energy?
Thank you Science Jesus 😝
who else is just watching for the intro
Timestamps:
This video does not need timestamps
Speed of light is not the speed limit.
There's a typo at 2:38
should be C = λ.f
nu is the symbol for frequency