When the school bell is hit with a hammer, it moves forward and backwards, producing compression and rarefaction due to vibrations. When it moves forward, it creates high pressure in its surrounding area. This high-pressure region is known as compression. When it moves backwards, it creates a low-pressure region in its surrounding. This region is called rarefaction. 3. Cite an experiment to show that sound needs a material medium for its propagation. Solution: Take an electric bell and hang it inside an empty bell jar which is fitted with a vacuum pump (as shown in the figure below). Initially, one can hear the sound of the ringing bell. Now, pump out some air from the bell jar using the vacuum pump. You will realise that the sound of the ringing bell decreases. If you keep on pumping the air out of the bell jar, then the glass jar will be devoid of any air after some time. Now, try to ring the bell. No sound is heard, but you can see the bell prong is still vibrating. When there is no air present in the bell jar, a vacuum is produced. Sound cannot travel through a vacuum. Therefore, this experiment shows that sound needs a material medium for its propagation. 4. Why is a sound wave called a longitudinal wave? Solution: The vibration of the medium that travels parallel to the direction of the wave or along in the direction of the wave is called a longitudinal wave. The direction of particles of the medium vibrates parallel to the direction of the propagation of disturbance. Therefore, a sound wave is called a longitudinal wave
5. Which characteristics of the sound help you to identify your friend by his voice while sitting with others in a dark room? Solution: Quality of sound is a characteristic that helps us identify the voice of a particular person. Two people may have the same pitch and loudness, but their qualities will be different. 6. Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why? Solution: The speed of sound is 344 m/s, whereas the speed of light is 3 × 108 m/s. The speed of light is less when compared to that of light. Due to this reason, thunder takes more time to reach the Earth as compared to light speed, which is faster. Hence, lightning is seen before whenever we hear thunder. 7. A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s−1. Solution: For sound waves, Speed = Wavelength × frequency v = λ × v Speed of sound wave in air = 344 m/s (a) For v = 20 Hz λ1 = v/v1 = 344/20 = 17.2 m (b) For v2 = 20,000 Hz λ2 = v/v2 = 344/20,000 = 0.0172 m Therefore, for human beings, the hearing wavelength is in the range of 0.0172 m to 17.2 m.
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in the air and in aluminium to reach the second child. Solution: Consider the length of the aluminium rod = d Speed of sound wave at 25° C, V Al = 6420 ms-1 Time taken to reach the other end is, T Al = d/ (V Al) = d/6420 Speed of sound in air, V air = 346 ms-1 Time taken by sound to each other end is, T air = d/ (V air) = d/346 Therefore, the ratio of time taken by sound in aluminium and air is, T air / t Al = 6420 / 346 = 18.55 9. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute? Solution: Frequency = (Number of oscillations) / Total time Number of oscillations = Frequency × Total time Given, Frequency of sound = 100 Hz Total time = 1 min (1 min = 60 s) Number of oscillations or vibrations = 100 × 60 = 6000 The source vibrates 6000 times in a minute and produces a frequency of 100 Hz. 10. Does sound follow the same laws of reflection as light does? Explain. Solution: Yes. Sound follows the same laws of reflection as light. The reflected sound wave and the incident sound wave make an equal angle with the normal to the surface at the point of incidence. Also, the reflected sound wave, the normal to the point of incidence, and the incident sound wave all lie in the same plane. 11. When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear an echo sound on a hotter day? Solution: An echo is heard when the time interval between the reflected sound and the original sound is at least 0.1 seconds. As the temperature increases, the speed of sound in a medium also increases. On a hotter day, the time interval between the reflected and original sound will decrease, and an echo is audible only if the time interval between the reflected sound and the original sound is greater than 0.1 s.
In this anime I like everything except the attitude of the main protagonist he should not be like a rude person he should be like a kind hearted person like he was before the power up this is a bad thing that main protagonist to Now doesn't care about anyone even he left a woman who take cares of him I am don't let him fight yes I am talking about his friend actually I forgot the name but still I can explain that's the orange hair girl at the starting of the Anime with gin woh and he also left the demon women that he bought from the 75th floor of demon Castle the main protagonist should be powerful and should be kind this is not how main protagonist need to be😢
![[1] He Became A Player And World's Destroyer Because of His Powerful System | Manhwa Recap](/img/n.gif)
1:31:21 Because cameraman never dies
Cameraman never die 😂😂
😂
🤣🤣
😅😂😂
What the f***k ..bro where are you saying 😑
@@Crezy-demon😮😮
2:42:24 kamal hai bhai aapki voice bhut aachi hai mera full support hai ❤❤
Systum To Bas Jin-woo Ka Hai,
Rehna Hai To Systumm Ke Niche Rehna Padega😂😂😂😂
😅
1:31:28 cameraman never dies😂😂
1:51 camera man never dies
1:32:01 Cameraman never dies from anything even than older ages
Beru the god is come finally
2:40:25 isase yah sabit hota hai ki Sun jinwoo ko apna durability point badhana chahie😊😊
that "kiyyaa" hits different 🤧
😂😂
You are my favorite explainer 🥰🥰🥰🔥🔥
Great explanation ❤ keep it up brother 👍🏼
Yes cameraman never 💀die
Bahut skip kar ke dikhate hi bhai tum.. jo shadows hunters pe lagayi thi wo to bataya hi nahi .
1:31:42:14 camera man never dies ☠☠
East or west camaraman is the best
Ya video mai na too edit kiya hai 😮😮❤
1:56:24 why he looking like Dr Strange 😂😂😂
Bhai love you brother bhot mast explain ha bro ❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤
camera man never die😂
2:34:55 bhai yha se anime bahut mast hai 2:35:29 2:35:30 2:35:31 2:35:31 2:35:31
bhai ka favourite dialogue- kyahhh
Vese aur bhi hai
@@AniExplainerbhai apki explaination ek no. Hai love you bro
@@AniExplainer Or ek hmm hai😊😊😂😂
I'm from Nepal. Love Ur explanation
Yo
Best explanesen brother ❤❤😊😊
Kyaaa! Was personal😂😂.
bhai etna bhi personal mat lo 😂.
😅
Hmm, bi he 😂
1:16:50 1:16:52 1:16:53 1:16:55 1:16:58 1:16:58 1:17:00
Pagal hai ky😂
Great explanation and kya is very awesome❤❤❤😂
Hello bhai tu apni language mein acche se explain karta hai😊
Jin woo be like woman nono demon 😂😂😂
hahahah
Super great explanation
2:34:55 bhai yha se anime bahut mast hai
❤
Cameraman man never die 😂😂
I very much like it 🎉🎉❤ thank you
The second cemara man never dei😮😂🎉
Die brother 😅
Yr arise jb bolona thora jorse bola na yr Aaaaariseeeeee
Cameraman Never dies😂😂😂😂
Thank you Bhai 😅❤😊
Tmhara explanation me bohot miss out ho raha he or sath me bohot cije miss out ho raha he
Ha bro bahut kuch miss out hua hai just like tusk ko magical fire stone jisse uska magic power boost hota hai aur bahut kuch 😢
Cameraman never die
Cameraman never die😂😂😂😂😂😂😂
Dipti director 2:26:25
are are ye nhi 😂
@@AniExplainer😂😂
Nice bro
Bohoat aachi video
Nice bro keep going support from karnataka
The way you say ...kyaaa..😂😂
😁
Nice 👍❤❤❤❤
Bhai Love you Kya Explanation hai maja Ageya full movie 😌♥️
Bro ap kaya kaya bohat bolte hoo ❤❤
Super cool bro❤
Background music ka thoda loud 🔊 kore 😊 voice thoda jayada sunai de dehi hai ✅ ❤
Pagel ho kya bhai
Camera never dies 1:48:36
Camera man never dies 1:31:00
Yes yes cemra man god 😈 this is never deis
@@shehnazbano2066what a English 😂😂
😂😂😂😂😂😂😂😂😂😂😂
Hehe
Because the camaraman never die baby 😂😂😂😂
Nice 😊😊
Mere ko gussa isliye ah raha hei ki aph ne long nahi banaya video ko.... Akh season ko 2.50 hour se jyada hona chahiye😢😢
Abe saale pata hai kitni mehnat Karni padti hai or ha me pata kon hu ani explainer ka dost hu vo din rat mehnat karta hai
Nice bro
CAMERAMAN NEVER GIVE UP😂🎉
#kyaaa is op😂❤
everything is temporary but kya is constant😂😂
1:51:37 cameraman never dies suiiiii
Aaj to maja hi aa gaya
Full season dekhake
🎉🎉🎉🎉
Ye banda video achhi bna rha hai pr har season chota kr rha hai😢
@@AdityaRawat-h8ryes bro .. Long video banao please bhai...
This anime is like player who Hides His Past because in that jiju island was in there
When the school bell is hit with a hammer, it moves forward and backwards, producing compression and rarefaction due to vibrations. When it moves forward, it creates high pressure in its surrounding area. This high-pressure region is known as compression. When it moves backwards, it creates a low-pressure region in its surrounding. This region is called rarefaction.
3. Cite an experiment to show that sound needs a material medium for its propagation.
Solution:
Take an electric bell and hang it inside an empty bell jar which is fitted with a vacuum pump (as shown in the figure below).
Initially, one can hear the sound of the ringing bell. Now, pump out some air from the bell jar using the vacuum pump. You will realise that the sound of the ringing bell decreases. If you keep on pumping the air out of the bell jar, then the glass jar will be devoid of any air after some time. Now, try to ring the bell. No sound is heard, but you can see the bell prong is still vibrating. When there is no air present in the bell jar, a vacuum is produced. Sound cannot travel through a vacuum. Therefore, this experiment shows that sound needs a material medium for its propagation.
4. Why is a sound wave called a longitudinal wave?
Solution:
The vibration of the medium that travels parallel to the direction of the wave or along in the direction of the wave is called a longitudinal wave. The direction of particles of the medium vibrates parallel to the direction of the propagation of disturbance. Therefore, a sound wave is called a longitudinal wave
Ay bhai ye anime hai physics class😅
2:17:47
Cameraman never die. 😅😅😅😅😅
Sung jinwoo was better than us of hunters s.s.s.s rank hunter😅😅❤
No better than national level hunter 🙃
SSR++
Kiyaa😂😂😂 OP
Best explains ❤
5. Which characteristics of the sound help you to identify your friend by his voice while sitting with others in a dark room?
Solution:
Quality of sound is a characteristic that helps us identify the voice of a particular person. Two people may have the same pitch and loudness, but their qualities will be different.
6. Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why?
Solution:
The speed of sound is 344 m/s, whereas the speed of light is 3 × 108 m/s. The speed of light is less when compared to that of light. Due to this reason, thunder takes more time to reach the Earth as compared to light speed, which is faster. Hence, lightning is seen before whenever we hear thunder.
7. A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s−1.
Solution:
For sound waves,
Speed = Wavelength × frequency
v = λ × v
Speed of sound wave in air = 344 m/s
(a) For v = 20 Hz
λ1 = v/v1 = 344/20 = 17.2 m
(b) For v2 = 20,000 Hz
λ2 = v/v2 = 344/20,000 = 0.0172 m
Therefore, for human beings, the hearing wavelength is in the range of 0.0172 m to 17.2 m.
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in the air and in aluminium to reach the second child.
Solution:
Consider the length of the aluminium rod = d
Speed of sound wave at 25° C, V Al = 6420 ms-1
Time taken to reach the other end is,
T Al = d/ (V Al) = d/6420
Speed of sound in air, V air = 346 ms-1
Time taken by sound to each other end is,
T air = d/ (V air) = d/346
Therefore, the ratio of time taken by sound in aluminium and air is,
T air / t Al = 6420 / 346 = 18.55
9. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
Solution:
Frequency = (Number of oscillations) / Total time
Number of oscillations = Frequency × Total time
Given,
Frequency of sound = 100 Hz
Total time = 1 min (1 min = 60 s)
Number of oscillations or vibrations = 100 × 60 = 6000
The source vibrates 6000 times in a minute and produces a frequency of 100 Hz.
10. Does sound follow the same laws of reflection as light does? Explain.
Solution:
Yes. Sound follows the same laws of reflection as light. The reflected sound wave and the incident sound wave make an equal angle with the normal to the surface at the point of incidence. Also, the reflected sound wave, the normal to the point of incidence, and the incident sound wave all lie in the same plane.
11. When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear an echo sound on a hotter day?
Solution:
An echo is heard when the time interval between the reflected sound and the original sound is at least 0.1 seconds. As the temperature increases, the speed of sound in a medium also increases. On a hotter day, the time interval between the reflected and original sound will decrease, and an echo is audible only if the time interval between the reflected sound and the original sound is greater than 0.1 s.
Ai ka copy kro aur chap do
Cameraman never dies 😅
Bahut accha explaine hai ❤❤❤❤❤
Boron ❌ demon king baren ✅
Wah😂
Yaar ..Fight ko skip kardiya
Deputy director ❌️ dipti director 🤡
Dipti 🤏🏻
glass - gilass
ant - aunt
soul - sawoul
I love it ❤❤❤
Kuch jada he kiiiya nahi ho gaya isme😂😂😂
Ay hay oi hoy ay hay oi hoy
Thank you bhaiya ❤❤
Solo leving never dies
Bro please next season 4 please 🥺 bro
In this anime I like everything except the attitude of the main protagonist he should not be like a rude person he should be like a kind hearted person like he was before the power up this is a bad thing that main protagonist to Now doesn't care about anyone even he left a woman who take cares of him I am don't let him fight yes I am talking about his friend actually I forgot the name but still I can explain that's the orange hair girl at the starting of the Anime with gin woh and he also left the demon women that he bought from the 75th floor of demon Castle the main protagonist should be powerful and should be kind this is not how main protagonist need to be😢
wow 🎉 bro super..
we are wating for season 4.....❤❤❤❤❤❤❤
🎊 1:04:40
Bhai 4 s class hunter die
One camera man never die 👿
😂😂🎉
From where didi you find this anime bro??
Bhai tumne feelings cheen li original Jo emotions aur jo likha he usme aapne sirf simple krdiya aur mazedaar kr sakte the
solo leveling ka season hai uske end me humne dekha tha jiju Island pe raid krne jarhe hote hai to second season me itna baad me kyo dikhata h
1 season me sare jiju Island pe s rank hunter jate hue dikhte to kya anime me or manga me itna agag hota hai?
Nice 👍🏻👍🏻
1:32:16 guys inko koi batao ki camera man never dies😂❤
1:42:35 camera men never dies😂
Mazaa aayaa
Apka "kyah" "Hmmm" "Ummm"
Kamalka hain😅
video thora lamba karo
Bhi are you ok??
Video chuta nahi he
My best anime 😍😍😍😍😍😍😍😍😍😊😊😂🤩😁😺😊😊😊
Wow your English😂😅
Bhai long video please😢😢😢
My favourite anime
1:17:43 😅
🎉
Thanks for video ❤❤❤🎉
Camera man never dies 1:31:34😂😂😂
bro tum bich ki bhot se story ko chhod kar bata rhe ho
Sahi bola
Dragon ball ka explaine karo plz
Season 4 solo level video ❤❤❤ next part bro