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

Elasticity
Density
Porosity
Viscosity

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

Ultraviolet radiations from Sun burn our retina
All radiations from sun initiate chemical reactions in eyes
Cosmic rays reach eyes more during the eclipse
Infrared radiations from sun burn our retina

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