1.

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be :

Answer»

increasing by a factor of 2
decreasing by a factor of 2
decreasing by a factor 4
unchanged .

Solution :Intensity of WAVE I = `2pi^(2) rho v^(2) r^(2) v`.
`rArr = I alpha v^(2) r^(2)`.
As amplitude r is DOUBLED and FREQUENCY is reduced to one-fourth
`therefore` Intensity of wave becomes `(1)/(4)` th
Hence correct CHOICE is (c).


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