In an experiment, Anhad studies sound waves. He sets up a loudspeaker to produce sound as shown below:
Anhad adjusts the signal to the loudspeaker to give a sound of frequency 200Hz.
What happens to the air in-between Anhas and the loudspeaker?
Explain how Anhad receives sound in both ears.
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The air in between Anhad and speaker vibrates with the frequency of $200Hz.$ Sound is a longitudinal wave, so successive compression and rarefaction is formed between Anhad and the speaker.
Anhad receives sound in the right ear by the sound waves transmitted directly from the loudspeaker, and in his left ear, he receives sound from sound waves reflected from the classroom wall.
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Three different vibrating objects produce three types of sounds $X$, $Y$ and $Z$. Sounds $X$ and $Y$ cannot be heard by a man having normal range of hearing but sound $Z$ can be heard easily. The sound $X$ is used in hospitals to break kidney stones of a patient into fine grains whioch then get flushed out with urine. The sound $Y$ is similar to that which is produced during an earthquake before the main shock wave is generated.
What t$Y$pe of sounds are $(i) X, (ii) Y$, and $(iii) Z$?
Name one device which can produce sound like $X$.
Name one device in a science laboratory which can produce sound like $Y$.
Name one device in our homes which can produce sound like $Z$.
A sound producing body is at considerable distance from a man. There can be four different media $W, X, Y$ and $Z$ between the sound producing body and the man. The medium $X$ brings the sound to man most quickly whereas medium $Z$ takes the maximum time. The time taken by medium $W$ in bringing sound to man is less than that of $X$ but more than that of $Z.$ The medium $Y,$ however, fails to bring the sound from the sound producing body to the man. Which medium could be the one:
Having no fixed shape and no fixed volume$?$
Having a fixed volume but no fixed shape$?$
Having the same composition as that on the moon$?$