Physics
Which of the following scientific discoveries was made by C.V. Raman?

Cyclotron
Super Conductivity
Inelastic scattering of light by molecules
Controlled nuclear fission

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.
sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.

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