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

0.16736111111111
0.084027777777778
0.052777777777778
0.044444444444444

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Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
Whose resistance falls almost to zero at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which turn into insulators at very low temperatures

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