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Question 13Wh...

Question

Question 13
Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

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Solution

Humming bees produce sound by vibrating their wings which is in the audible range. In case of pendulum, the frequency is below 20 Hz which does not come in the audible range.The audible range is from 20 Hz to 20,000 Hz.

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Q. Question 13
Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

Q. Why we can hear the sound produced by bees but we cant hear the sound of vibrations of pendulum?

Q. Question 17
We have learnt that vibration is necessary for producing sound. Explain why the sound produced by every vibrating body cannot be heard by us?

The sound of a bomb explosion travels faster than the sound produced by a humming bee.

Q. Answer the following questions briefly.
(a) 'A' vibrates 200 times in 5 s, while 'B' vibrates 35 times in 1 s. Which sound will have a lower pitch?
(b) Why do we need two ears?
(c) Why can't we hear the sound made by bats?
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(e) How can you raise the pitch of the note of a veena string without changing its length?
(f) The harder you beat a drum, the louder is the sound produced? Explain why this is so.
(g) Why are the walls and ceiling of a cinema hall covered with sound-absorbing material?

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Music and Noise

Standard VIII Physics

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