Physics
Stationary wave is formed by

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

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Physics
Why does the sea appear blue in colour?

Refraction of the sun light
Scattering of the sunlight by water molecules
Reflection of the sun light from water surface
Interference of the sun light from water surface

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