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Class XII Physics Atoms 1

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Question 1

The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

Question 2

Suppose an electron is attracted towards the origin by a force , where k is a constant and r is the distance of the electron from the origin. By applying Bohr model to this system, the radius of the nth orbital of the electron is found to be rn and the kinetic energy of the electron to be Tn. Then which of the following is true?

Question 3

The kinetic energy of a free electron doubles. Its deBroglie wavelength changes by the factor

Question 4

In hydrogen atom, the radius of nth Bohr orbit is rn. The graph between log (rn/r1) and log n will be -

Question 5

The wavelengths involved in the spectrum of deuterium are slightly different from that of hydrogen spectrum, because

Question 6

An α-particle of energy 5 MeV is scattered through 180° by a fixed uranium nucleus. The distance of the closest approach is of the order of

Question 7

A hydrogen atom in ground state absorbs 10.2 eV of energy. The orbital angular momentum of electrons is increased by

Question 8

An electron falls from rest through a potential difference of 100 V. What is its de Broglie wavelength ?
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Mar 28JEE & BITSAT