A louder sound must have a higher frequency than a weaker sound. True False Two

Question

A louder sound must have a higher frequency than a weaker sound. True False Two sound waves have frequencies 240Hz and 260Hz respectively. When they make a beat sound, the pitch (frequency) of the beat sound is ______. Higher than 260Hz Lower than 240Hz Between 240 and 260Hz To obtain good waveform measurement of sound, we will set the sampling rate at 10KHz. True False For a wave function y = (4.304cm) cos((2.541/s) * t), please determine its frequency (in units of Hz). For a function y = (6.728cm) cos((4.744/s) * t), please determine the period (in units of seconds) of the wave.

Explanation / Answer

1)True

The loudness is called as picth of the sound. The pitch is higher for high freqency and low for lower frequency.

2)Lower than 240 Hz

since beat frequency is given by:

f(beat) = f2 - f1

3)False

the requirement is upto 40 kHz

4)y = 4.304 cm cos(2.541 t)

we know that general form is ; y = A cos(wt)

on comparing, w = 2.541 per sec = 2.541 Hz

Hence, f = 2.541 Hz

5)on comparing we get,

f = 4.744 per sec or Hz

we know that, period = T = 1/f

T = 1/4.744 = 0.211 s

Hence, T = 0.211 s

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