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PHYSICS

Physics
When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as

Echo
Doppler effect
Resonance
Beats

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Physics
Propagation of sound can be visualised as propagation of ________ variations in the medium

Porosity
Viscosity
Elasticity
Density

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Physics
Permissible noise level at Residential area during night time is :

80 dB (A)
75 dB (A)
45 dB (A)
55 dB (A)

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Physics
Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s

0.016
0.008
1000
2000

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Physics
Which waves cannot be transmitted through vacuum?

Electromagnetic
Sound
Heat
Light

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