Physics
We always see the same face of the moon, because

It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth
It takes equal time for revolution around the earth and rotation on its own axis
It rotates at the same speed as the earth around the sun

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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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