Physics
The velocity of heat radiation in vacuum is

Greater than that of light
Less than that of light
Equal to that of sound
Equal to that of light

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

The density of salt solution exceeds the density of eggs
Egg absorbs salt from the solution and expands
Albumin dissolves in salt solution and egg becomes lighter
Water has high surface tension

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