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

24 cm
1 cm
12 cm
6 cm

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

The silver piece will weigh more
Both silver and gold pieces weigh equal
Weighing will depend on their masses
The gold piece will weigh more

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