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Free Online Mock Physics Multiple Choice Test on Atomic Nuclearphysics
Sub Category : Atomic Nuclearphysics Test : 9 Time Left :
1) The wavelength of light emitted from second orbit to first orbit in a hydrogen atom is (1) 1.215×10-7 m (2) 1.215×10-5 m (3) 1.215×10-4 m (4) 1.215×10-3 m
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2) Energy of the electron in nth orbit of hydrogen atom is given by En= -13.6/n2. The amount of energy needed to transfer electron from 1st orbit to third orbit is(1) 13.6 eV (2) 3.4 eV (3) 12.09 eV (4) 1.51 eV
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3) The ratio of speed of an electron in ground state in Bohr’s first orbit of hydrogen atom to velocity of light in air (c) is (1) e2/2e0hc (2) 2e2e0/hc (3) e3/2e0hc (4) 2e0hc/e2
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4) The innermost orbit of the hydrogen atom has a diameter 1.06Å. The diameter of tenth orbit is(1) 5.3 Å (2) 10.6 Å (3) 53 Å (4) 106 Å
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5)The S.I. unit of radioactivity is
(1) Roentgen (2) Rutherford (3) Curie (4) Becquerel
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