Given that threshold intensity of hearing at 1 kHz is 10-12 W/m2 , the density of air be 1.28 kg/m3 and the speed of sound is 324 m/s. what is the pressure amplitude of the sound waves in air?
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a
7⋅2×10−6Pa
b
14⋅4×10−6Pa
c
28⋅8×10−6Pa
d
57⋅6×10−6Pa
answer is C.
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Detailed Solution
we know that I=P02/2ρv or P0=(2Iρv) ∴ P0=2×10−12×1.28×324 =28⋅8×10−6Pa
Given that threshold intensity of hearing at 1 kHz is 10-12 W/m2 , the density of air be 1.28 kg/m3 and the speed of sound is 324 m/s. what is the pressure amplitude of the sound waves in air?