Physics
Stationary wave is formed by

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

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Physics
The sky appears blue because

The atmosphere scatters blue colour more than the others
It is actually blue
All colours interfere to produce blue
In white light, the blue component dominates

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