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What does P exactly stand for ? Explain the answer
Asked by Supersanny18 | 19 Dec, 2019, 10:03: PM
Expert Answer
P = 0.01 cos(1000t -3x) ..................(1)
Above eqn. represents the pressure variation when longitudinal sound wave travels in air
P stands for pressure.
Pressure amplitude Pmax and displacement amplitude A are related as,
Pmax = ρ us ω A ...................(2)
where ρ is density, us is speed of sound, ω is angular velocity.
density of air ρ = 1.2 kg/m3
speed of sound us = [ B / ρ ]1/2 = [ 1.4 × 105 / 1.2 ]1/2 ≈ 342 m/s
Displacement amplitude A = Pmax / ( ρ us ω ) = 0.01 / ( 1.2 × 342 × 1000 ) = 2.44 × 10-8 m
Answered by Thiyagarajan K | 20 Dec, 2019, 08:30: AM
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