Waves - Result Question 10

10. A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is[2005]

(a) 3:2

(b) 2:3

(c) 9:4

(d) 4:9

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Answer:

Correct Answer: 10. (c)

Solution:

  1. (c) Intensity = Energy/sec/unit area

Area r2I1/r2

I1I2=r22r12=3222=94



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