Atomic and Molecular Physics test-10
Answer all questions Time 30 min
Max 20 marks
1 The maximum frequency of υ of continuous X-ray is related to the applied potential difference V as
a) υ α V1/2 b) υ α V c) υ α V3/2 d) υ α V2
2 Generation of X-ray is a
a) phenomenon of conversion of mass into energy
b) principle of conservation of momentum
c) phenomenon of conversion of kinetic energy into radiant energy
d) none of the above
3 X-rays can be used
a) to cure blood cancer
b) to detect defects in precious stones and diamonds
c) to detect gold under the earth
d) for cutting and welding metals
4 In the production of X-rays by Coolidge tube, intensity and quality of X-rays
a) can be controlled independently
b) cannot be controlled independently
c) are one and the same
d) none of the above
5 The intensity of X-rays mainly depends upon
a)nature of the target material b) nature of the gas in the tube
c) current in the tube d) accelerating voltage applied
6 The maximum frequency of limit of continuous X-rays depend on
a) KE of incident electron b) nature of the target
c) degree of vacuum in the tube
d) the shortest wavelength in the characteristic X-ray spectrum of target material
7 When fast moving electrons strike a metal of high atomic number, the percentage of energy converted with X-rays is
a) about 10% b) about 20% c) less than 10% d) less than 40%
8 In an X-ray tube
a) applied potential is 1000V b) applied potential is 106 V
c) cathode and anode emit electrons d) X-rays move from cathode to anticathode
9 The intensity of X-rays depends on
a) KE of electrons b) number of electrons striking
c) total momentum of electrons d) none of the above
10 X-ray absorption will be a maximum for sheets of
a) Ag b) Pb c) Cu d) Fe
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