Suppose a speaker is sending out a signal of a given power uniformly in all dire

Question

Suppose a speaker is sending out a signal of a given power uniformly in all directions. You are located a certain distance from the speaker measuring the intensity of the sound. Given the following different situations, rank the measured intensity (1 = the lowest intensity).
1 2 3 4 5  Power of speaker is (1/4)P and distance to speaker is (1/2)d.
1 2 3 4 5  Power of speaker is 4P and distance to speaker is 2d.
1 2 3 4 5  Power of speaker is (1/4)P and distance to speaker is 2d.
1 2 3 4 5  Power of speaker is 2P and distance to speaker is 2d.
1 2 3 4 5  Power of speaker is P and distance to speaker is d.

Explanation / Answer

say if I IS P/A

then 1---- I = p/d^2

2----- I = p/d^2

3----- I= p/16 d^2

4----- I= p/2d^2

5----- I= p/d^2

now rankingin is 1=2=5 >4>4

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