Question

(a) What differences will you hear in a sound if there is an increase in (i) amplitude, and (ii) frequency?

(b) Calculate the time period of a pendulum which is vibrating with a frequency of 10 Hertz.

Answer 1

(a) (i) if there is an increase in the amplitude of vibration then the sound produced becomes louder.

(ii) if the frequency of vibration increases then the pitch of the sound is high/the sound produced is high pitched.
This is because loudness of the sound depends on its amplitude so if the amplitude increases then the sound is loud and if the amplitude is decreased then the sound is relatively softer. In the same way, if the frequency is increased then the sound is high pitched and if the frequency decreases the sound is low pitched.

(b) Time period and frequency are related by the equation:

$T=\frac{1}{f}$

Where:

T = time period in seconds, s

f = frequency in Hertz, Hz

So,$T=\frac{1}{10}$

That is, 0.1 seconds