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

Audible sounds
Ultrasonics
Megasonics
Infrasonics

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Physics
In total internal reflection, the light travel from

Rarer to denser medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity

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