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

1 cm
24 cm
6 cm
12 cm

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Physics
What is the principle of a ''Life Jacket"?

It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat
The person can sit on it like a raft
It provides oxygen to a drowning person

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