Physics
If the phase difference between two points is 120° for a wave with velocity of 360 m/s and frequency 500 Hz, then path difference between the two points is

12 cm
1 cm
6 cm
24 cm

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Physics
Stationary wave is formed by

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

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