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PHYSICS

Physics
The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as

Infrasonics
Megasonics
Audible sounds
Ultrasonics

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Physics
In mirrors the back surface is coated with a thin layer of :

Red oxide
Mercury
Silver
Silver nitrate

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Physics
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.

Reflection
Refraction
Diffraction
Total internal reflection

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Physics
The snow on the mountains does not melt all at once when it is heated by the sun because:

It reflects most of the heat from the sun
It has a low specific heat capacity
It becomes very hard
It has a high latent heat of fusion

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Physics
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly

Absorb heat from the atmosphere send it towards earth
Prevent cold waves from the sky descending on earth
Reflect back the heat given by earth
Produce heat and radiate it toward earth

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