Physics
Which is a correct way to measure wavelength?

Nearest trough to peak
Nearest peak to nearest trough
None of these
Nearest peak to peak

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

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

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