Physics
In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge?

Asteroid belt
Black hole
Ozone hole
White hole

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Physics
Stationary wave is formed by

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
A transverse wave superposing a longitudinal wave

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