Sound WavesHardBloom L3
Question
Two vibrating tuning forks produce progressive waves given by y1=4 sin(500πt) and
y2 = 2 sin(506πt). These tuning forks are held near the ear of a person. The person will hear
Options
A.3 beats/s with intensity ratio between maxima and minima equal to 4.
B.3 beats/s with intensity ratio between maxima and minima equal to 9.
C.6 beats/s with intensity ratio between maxima and minima equal to 4.
D.6 beats/s with intensity ratio between maxima and minima equal to 9.
Solution
Sol. Beat = f2 –f1 = 253 – 250 = 3Hz
Iman ∝ (Amax)2 = (4 + 2)2 = 36
Imin ∝ (Amin)2 = (4 – 2)2 =4
So 
= $\frac{36}{4}$ = 9
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