Hertz and Radio Waves Explained, validating Maxwell's predictions
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- Опубліковано 28 тра 2016
- This video examines the experiment Hertz performed to validate Maxwell's prediction for electromagnetic waves. It also touches on his observation of the photoelectric effect.
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I have always been fascinated by the figure of James Clerk Maxwell who, with his equations, was able to theorize all this !!!
Don’t forget about John Moses browning who developed so many fire arms with just their mind .
Hertz was amazing to understand this stuff you cant see. These people are so smart
These are exciting videos. Learning how mathematical predictions of phenomena were verified experimentally helps think about physics and math in new ways and for future work in physics experiments and mathematics.
one of the best videos on the topic so far
this is a great video! thank you
You are my teacher and physician. Thank you very much.
An excellent history and review!
I am loving your teaching class so much🎉
nicely explained
Best Hertz description on the internet. Or anywhere else for that matter.
Nice!
@5:00 fascinating visual explanation.
tx my guru...the explanation is highly clear
Ooh guru now 😄. Thanks
OMG. I have only just found out that sound waves originate in light. OMG. I also just found out the difference between frequency and wavelength. Thanks for the video.
Superb. Thanks.
Glad you liked it
You are drawing the wave from the two electric balls (sender), but I think the wave actually is being pushed from the left and right antenna (alternate) ....you agree?
Sir why have you used that circular diaphragms?
your content for the hsc is incredible...between your videos and khan academy, this is so much better suited for the hsc....keep it up and thankyou
Khan academy is awesome
5:30 why there is no spark on that area? and why there is spark in the other? thankyou!
Thank you
You’re welcome.
thanks!
you are welcome
Question 🙋♂️
With the ring he was able to detect the transverse component of the EM wave. What about the other perpendicular part, is it possible to detect it somehow ? Maxwell described EM wave as E and M perpendicular to each other, so far Hertz demonstrates only one part of it, what about the other ?
Thank you
Would this experiment be the same as the cathode ray tube?
do you think Maxwell or Hertz made the greatest contribution to our current use of radio
waves? Would be great 95if somebody could link some info
Hey Sir, also doing the HSC physics course needed to know if we had required to know about polarisation and the effects of the receiver being placed at different angles relative to the induction coil. If so could you briefly explain, thanks!
+Madhav Sunderram you don't specifically need to know about polarisation. The chief point is that hertz did a variety of experiments, including polarisation and standing waves, to determine the wavelength and hence the speed. This confirmed that Styx was examining a an EMR phenomena
I was turning my TV and wanted to know how the hell I it worked.. Thanks man
@AJsolider yeah
Jimmy from Scotland ,Mick from the elephant & castle in London England ,Rudy from Hamburg & Guglielmo from Bologna gave me my hobby 😊
Here is what i thought.
For a magnet, some force aligns pound metal around the magnet in a certain way. And i think the pound is assigned only in the blank force field.
Not because of two em wave interfere each other, i would say the force exist in non continual form but in several lines.
So there was no spark in blank force field.
I am curious to know how did he calculate the frequency!
Copied a comment from Physics High below :)
4 years ago
Good question. In essence the charge emitter (two balls with a spark in between) is in essence an LC circuit - a combination of an inductor (L) and a capacitor (C). The Physics of that is governed by some laws, incl Kirchoff's Laws, and from the mathematic derivation you can calculate the angular frequency and hence the natural frequency of the oscillating circuit. Thus Hertz, from his set up knew the frequency. If you are studying NSW Physics, this is NOT examinable, otherwise I would do further research on LC circuits
Please make a video on Amplitude modulation your explanation is amazing
It’s on my to do list. Can’t promise dates though.
It's ok but for love of physics please do it soon
Do you have an explanation why the receiver produced large sparks and small sparks while moving it along the waves?
I assume you meant when hertz set up standing waves. Standing waves are an example of interference. At certain points there are nodes where the is no net field, thus no induction thus no spark
What's the software you are using in the video demonstration please?
I use Inspire by Promethean
High School Physics Explained Thank you :)
Sounds like listening to a podcast half asleep...
So how did he determine the frequency of the standing wave? I didn't quite get that from the video. Thanks in advance!
Good question. In essence the charge emitter (two balls with a spark in between) is in essence an LC circuit - a combination of an inductor (L) and a capacitor (C). The Physics of that is governed by some laws, incl Kirchoff's Laws, and from the mathematic derivation you can calculate the angular frequency and hence the natural frequency of the oscillating circuit. Thus Hertz, from his set up knew the frequency. If you are studying NSW Physics, this is NOT examinable, otherwise I would do further research on LC circuits
Ok, thank you
Woopterian the frequency can be determined from the wave lenght, from the video we can observe his experiment when he created standing wave and place the receiver inside the standing wave, by doing this he can find the wavelenght and thus the frequency
In normal standing waves that is true IF you knew the speed. In standing waves with springs and sound, speed is the known factor. V= freq x wavelength. But in the case of Hertz he did not know the speed, in fact he was trying to determine it. Therefore frequency has to be determined in another way.
So voice by its vibration,
Causes matter/matters to vibrate to what?
If nothing was before matter, why the heck should anything be mattered? Or be even thought about living?
If voice or sound, had the ability to cause change of anything, what would it change?
danke
Hertz demonstrated refraction of radio waves through a triangular prisms of paraffin and of PITCH, not of PITCHBLENDE (uranium oxide) as incorrectly stated at 4:27.
My bad. I stand corrected. Thanks
Hertz experiment is one of the most...... wait! my wavelengths corrupted.
5:49 why is the wavelength actually half the wavelenght?
It’s a standing wave so node to node is half wavelength not full one
does any mass get transferred from the transmitter to the receiver?
No.
Maybe I didn't ask the question properly. If E=M then it seems that a radio having received a signal would be more massive because of it having received the energy from the transmitter. Sorry if this seems ignorant to you but my physics teacher is youtube clips and I'm a slow learner.
So how did he determine it was possible to send sound. Cant imagine he even thought it was possible when he did these experiments. Thanks
+Bobby Middleton hertz didn't. He in fact thought there was no practical value. By 1905, Marconi had develop trans Atlantic radio communication.
High School Physics Explained Thanks I actually did more research and discovered Reginald Fessenden had the theory of sending voice and finally proved it in 1906 by sending the first broadcast.
+Bobby Middleton correct. Marconi often gets credit but was Canadian Fessenden who was first.
@@BobbyMiddleton And it should be also noted that the first practical use was transmitting *morse code*, which was done by simply switching the signal on and off. Sending actual audio signal (analog modulations) was much later invention.
But how did Hertz figured out the distance between source of radio wave and a reflector to cause resonance??
trial and error. Not all lengths will give resonance as you probably know but once he got resonance the length was measured and thus the wavelength
i dont remember maxwel said it as charge particle :)
If there's other life forms in the Universe, I think they would communicate mathematically.
am really curious about these kind of things but., language, english, obstacle to get in to there
+ math oh sh*t man
Might want to correct your dates... Hertz died in 1894, 1905 is when Einstein was working on photoelectric effect. Otherwise great video.
Aren't electro magnetic waves light?
Light is a form of EMR rather than the other way round.
Thanks Mario. I thought I was the only one wondering about this. Since no one explained this before.
At 5:50 , it should be lamda/4
up3_sgb
i see you
During tesla time many scientist become famous for his invention....urban legend
I love you as my father
1894 not 1994.. if he died in 1994 he'd be 141ish
Hi
7:30 no idea what you said there.
I did mumble that didn’t I
What I was saying in effect was that quartz had no effect. Ie the spark was larger, longer. So photoelectric effect took place. But not the case with the glass window since glass absorbed UV.
@@PhysicsHigh hahahah i was going to ask the same question... so thank you
So who came first? The chicken or the egg?
Presumptuous and ambiguous!!!!
God is so wonderful!! Much thanks and glory to God who led him. Salute to physicsts.
Yooooo
You're The Spark 🤔
Nikola Tesla invented the radio.
Or so some uninformed people believe.
Tesla told him his theory was wrong
nein
how foolish we are to believe that radio waves are like 2D water waves that makes surface water oscillates up and down when in fact radio waves travel in space and photons are non stationary particles that just move up and down. 🥱🥴 dumb physics
Ambiguous explanation because it lacks the illustrations. Lame!!!!
nothing but diagrams and cartoons sad