Physics
Stationary wave is formed by

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

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Physics
Stars twinkle because

the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.
the distance of the stars from the earth changes with time.
None of these

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