Physics
Stationary wave is formed by

A transverse wave superposing a longitudinal wave
Two waves of the same speed superposing
Two waves of same frequency travelling in the opposite direction
Two waves of same frequency travelling in the same direction

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Physics
Indicate the false statement about the resistance of a wire

Resistance of metallic wire increases with increase in temperature
It is directly proportional to the length of wire
It is directly proportional to the area of cross-section of wire
It depends on material of wire

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