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The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

Intensity of light depends on

A man first moves 3 m due east, then 6 m due north and finally 7 m due west, then the magnitude of the resultant displacement is:

A stone is just released from the window of a moving train moving along a horizontal straight track. The stone will hit the ground following a

Which of the following (referred to a spherical mirror) depends on whether the rays are paraxial or not?