Two sound sources produce progressive waves given by y 1 =12 cos 100πt and y 2 = 4 cos 102πt near the ear of an observer. When sounded together, the observer will hear
A
2 beats per two sound 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 
so beat frequency 
Now intensity ratio of maximum & minimum value
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