Physics
When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :

Reflection
Damped vibrations
Refraction
Forced vibrations

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Physics
Stationary wave is formed by

A transverse wave superposing a longitudinal wave
Two waves of the same speed superposing
Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction

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