Physics
Matter waves are

Transverse waves
Longitudinal waves
Electromagnetic waves
De Broglie waves

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Physics
What is refractive index ?

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

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