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

Megasonics
Audible sounds
Infrasonics
Ultrasonics

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Physics
Energy in reflected light :

Does not depends on the angle of incidence
Becomes maximum for angle of incidence equal to 45°
Increases with the increase in angle
Decreases with the increase in angle of incidence

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Physics
A standing wave occurs when

The speed of the wave is zero or near zero
The amplitude of a wave exceeds its wavelength
A wave reflects upon itself
Two waves overlap

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