Physics
Propagation of sound can be visualised as propagation of ________ variations in the medium

Density
Elasticity
Viscosity
Porosity

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Physics
What is refractive index ?

It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
None of above
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

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