Physics
If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?

0.044444444444444
0.16736111111111
0.084027777777778
0.052777777777778

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Physics
Purpose of an optical filter is to

Refract light of different colours
Transmit or absorb light of different colours
Reflect lights of different colours
Dispense light into component colours

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