Physics
The wavelength of a wave is the distance between

Trough and Trough
Crest and Crest
Crest and Trough
Both B & C

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Physics
A drop of liquid assumes spherical shape because:

Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume
Inter molecular forces are weak in liquids
A sphere has the largest surface area for a given volume

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