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Q.

When two waves of nearly equal frequencies superimpose them. The frequency of combined wave is 'f1', that of the amplitude is 'f2' and the beat frequency is 'f3'. Arrange them in increasing order of frequency.

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a

f3 < f2 < f1

b

f1 < f3 < f2

c

f2 < f3 < f1 

d

f1 < f2 < f3

answer is C.

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Detailed Solution

y1=Asin2πf4t

y2=Asin2πf5t

ynet=2Acos2πf4-f52tsinπ2f4+f52t

Given, f1=f4+f52 ; f2=f4-f52 ; f3=f4-f5

Thus, f2 < f3 < f1 

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