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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

Resonance
Echo
Beats
Doppler effect

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

Viscosity
Elasticity
Porosity
Density

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

45 dB (A)
55 dB (A)
75 dB (A)
80 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
2000
1000

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Physics
Which waves cannot be transmitted through vacuum?

Sound
Light
Electromagnetic
Heat

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