13. A spherical sound wave is emitted by a point source. Relative to the sound l

Question

13. A spherical sound wave is emitted by a point source. Relative to the sound level 1 m from the source, the sound level 2 m from the source is about: 14. The two metallic strips that constitute some thermostats must differ in: 15. The diagram shows four slabs of different materials with equal thickness, placed side by side, He flows from left to right and the steady-state temperatures of the interfaces are given. Rank the material according to their thermal conductivities, smallest to largest.

Explanation / Answer

13)

Here , as the intensity is proporational = 1/d^2

Now, as I1 = I0

for I2 = I0/2^2

I2 = I0/4

the intensity at 2 m is

I2 = 10 log(I0/4 * I0)

I2 = -6.0 dB

the sound level at 2m is (C)-6 dB

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