Physics
A particle is thrown vertically upward. When it reaches the highest point, it has

A downward acceleration
An upward acceleration
A downward velocity
A horizontal velocity

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Physics
What is refractive index ?

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.
None of above

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Physics
The mass defect is the result of what action occurring?

Mass being converted to energy when protons and neutrons bind together in a nucleus
Mass being converted to energy when protons and neutrons break apart in a nucleus
Energy being converted into moles of atoms when neutrons break apart protons
Protons and electrons being attracted to each other

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