A sound is a vibration that propagates through a medium in the form of a mechanical wave. The medium in which it propagates can either be a solid, a liquid or a gas. Sound travels fastest in solids, relatively slower in liquids and slowest in gases.
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Longitudinal displacement of the sound wave
y = A sin (ωt – kx)
1.Speed of Sound
Where P = Elastic modulus for the medium
ρ = density of the medium
γ = radio of specific heat
2. Loudness of sound
L = 10 log10(I/I0) dB
I0 = the minimum intensity human ear can hear
I = intensity at a distance r from the point source
3. Open organ pipe
The frequency of the pth overtone is (p + 1)n1
where n1 is the fundamental frequency
The frequency of harmonics are in the radio 1:2:3….
4. Closed organ pipe
The frequency of the pth overtone is (2p+ 1)n1
where n1 is the fundamental frequency
The frequency of harmonics are in the radio 1:3:5….
5. Beat frequency
Beat frequency
Where, f1 and f2 are the frequency of the two waves
6.Doppler Effect
The observed frequency f’ = f (v-v0/v-vs)
Apparent wavelength λ’ = λ (v-vs/v)
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- NEET Physics Syllabus
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- How to Score 170 Plus in NEET Physics
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