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
24 cm
6 cm
1 cm

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Physics
The bats can fly in the dark because

They can see the objects in darkness
They generate flashes of light
They have weak legs and are likely to be attacked by predators
They generate ultrasonic sound waves

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