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

Moon
Earth
Venus
Saturn

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Physics
What is refractive index ?

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

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