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

0.16736111111111
0.044444444444444
0.052777777777778
0.084027777777778

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to contraction in winter can be avoided
Steel can be saved
Air-gaps are necessary for bearing the weight of running train
Accidents due to expansion in summer can be avoided

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