Question
A person is standing 1 km away from a source of sound. The velocity of sound in the medium is 340 ms−1. Calculate the number of oscillations (approximately) that the sound wave makes before it reaches that person. The frequency of the sound is 500 Hz.
Answer: Option C
:
C
Given:
Distance between source and observer, s=1000m
Velocity of sound, v=340ms−1
Frequency of sound, f=500Hz
Time taken for the sound wave to reach the observer from the source is:
t=sv
Number of oscillations in 1s is the frequency, f
Number of oscillations in time t will be:
n=tf
n=svf
n=1000×500340
n≈1470
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:
C
Given:
Distance between source and observer, s=1000m
Velocity of sound, v=340ms−1
Frequency of sound, f=500Hz
Time taken for the sound wave to reach the observer from the source is:
t=sv
Number of oscillations in 1s is the frequency, f
Number of oscillations in time t will be:
n=tf
n=svf
n=1000×500340
n≈1470
Was this answer helpful ?
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