Physics
The reverse effect of X–ray emission is

Zeeman effect
Photoelectric
Compton effect
Raman effect

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Water in the pipes freezes and on freezing water expands, so pipes break
Frost makes the pipes rusty, so they break
The material of which pipes are made contracts due to cold and so breaks
None of these

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