Physics
A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ?

They must have the same volume
They must have the same mass
They must be dropped in vacuum
They must have the same density

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Physics
Energy in reflected light :

Does not depends on the angle of incidence
Decreases with the increase in angle of incidence
Increases with the increase in angle
Becomes maximum for angle of incidence equal to 45°

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