Two sound sources produce progressive waves given by y 1 =12 cos 100 π π t and y 2 = 4 cos 102 π π t near the ear of an observer. When sounded together, the observer will hear
A
2 beats per second source with an intensity ratio of maximum to minimum nearly 4 : 1
B
1 beat per second with an intensity ratio of maximum to minimum nearly 
: 1
: 1
C
2 beats per second with an intensity ratio of maximum to minimum nearly 9 : 1
D
1 beat per second with an intensity ratio of maximum to minimum nearly 4 : 1
Text Solution
Verified by ExpertsThe correct answer is:
D
frequency of two source n 1 = 50, n 2 = 51
so beat frequency = 1/sec.
Now intensity ratio of maximum & minimum value
= 
= 
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