Please don\'t just leave a blank page as an answer. Happened a few times before.

Question

Please don't just leave a blank page as an answer. Happened a few times before. Thanks You hear a speaker playing a sand wave from a distance of 1 meter. If you move to a distance of 2 meters, what will happen to the intensity of the sound wave reaching you? The sound wave will have 4 times the original intensity The sound wave will have double the original intensity The sound wave will have exactly the same intensity The sound wave will have half the original intensity The sound wave will have 1/4 the original intensity When a standing wave exists on a string that is fixed at both ends, the ends of the string are: both nodes both antinodes one node and one antinodes

Explanation / Answer

1. Intensity I = power/area    = P/4pi r^2

so I is inversly proportioanl to r^2

I2/I1 = r1^2/r2^2

I2/I1 = r1^2/ 4 r1^2

I2/I1 = 1/4 times

option E is the correct answer:

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the ends of the stringd must as both nodes at both the ends

option A it

this is becox particles of the waves are compressed with the region of the wave

so as the answer

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