Physics
Which of the following celestial bodies contains abundant quantities of helium-3, a potential source of energy ?

Venus
Earth
Saturn
Moon

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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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