Q⟩ Gogi is singing a song of Frequency 500 Hz and have a Wavelength of 20 cm . So how much time will it take to reach a person's ear who is standing 300 m away from Gogi ?
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A useful quantity for describing the loudness of sounds is called sound intensity. In general, the intensity of a wave is the power per unit area carried by the wave. Power is the rate at which energy is transferred by the wave. In equation form, intensity I is
I = PA,
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v= 500 Hz, XY = 600m , t= 2s
Velocity of wave, v = timeDisplacement
=2600=300m/s
But, v=v×λ
⇒λ=vv=500300=53m
∴ No. of waves in displacement XY
=λXY=53600=3600×5
200×5=1000
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