Physics
Gamma rays are emitions that have

Mass but no charge
Charge but no mass
Neither mass nor charge
Both mass and charge

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Physics
Mirage is due to:

Unequal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Magnetic disturbances in the atmosphere
Equal heating of different parts of the atmosphere

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Physics
Isotopes of an element contain

equal number of protons and electrons
the same number of neutrons but different number of protons
equal number of nucleons
the same number of protons but different number of neutrons

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