1.

The velocity of sound in gas in which two waves of wavelength 1.0 m and 1.01 m produces 4 beats/s is :

Answer»

360 m/s
404 m/s
1010 m/s
440 m/s

SOLUTION :`v_(1) = (v)/(lambda_(1)) = (v)/(1) and v_(2) = (v)/(lambda_(2)) = (v)/(1.01) `
Now `b = v_(1) - v_(2) = (v)/(1) = (v)/(1.01) `
4 = v `[ 1 - (1)/(1.01) ] `
`RARR "" v = 404ms^(-1)` .
HENCE the correct CHOICE is (b).


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