The sound from an insect is produced when it vibrates its wings at an average rate of 500 vibrations per second:
(a) What is the time-period of the vibrations ?
(b) What is the frequency of the vibrations in hertz ?
(c) Can we hear this sound? Why or why not?
Answers
Answered by
6
Answer:
c yes we can hear the sound beacause the can human being can hear a sound upto 10 decible and the sonud of the wing of an insect is 10to 15 decible if it is near our ear
Answered by
15
(a) The time-period of the vibrations is 0.0025
(b) The frequency of the vibrations is 500 Hertz
(c) Yes, humans can hear the sound as it is within hearing range of humans.
Given:
Average rate = 500 vibrations per second
Formula:
T = 1/f
Where,
f = Frequency
Solution:
- Time period is reciprocal of frequency. Frequency is defined as number of beats/vibration per second.
- From question, frequency is 500 vibration per seconds which is expressed in the unit Hertz.
T = 1/500 = 0.0025 seconds
- Human ear can detect sound from 20 Hz to 20 kHz but the hearing tendency of the humans varies individually.
- Sound depends on loudness which is expressed with unit decibel.
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