# Atomic physics test

When high energy electrons pass close to the nucleus of target atom, they are retarded due to which X-rays of continuous frequency and all possible wavelengths are emitted. This phenomenon is known as
Compton effect
Bremstrahlung
Bain bridge mass
None of the above
According to which of the following, it has been found that the square root of the frequency is directly proportional to (Z-1), where Z is the atomic number, because the electron which goes from the L-shell to the K-shell moves in an electric field which is essentially that of the positive nuclear charge of the electron still remaining in the K-shell?
Bragg’s law
Raman’s law
Moseley’s law
Thomson’s law
If X-rays of wavelength 2 Ao are detected at an angle of 30o in the first order, then the spacing between the adjacent planes of the crystal would be
2.0 Ao
3.7 Ao
4.3 Ao
4.9 Ao
Who among the following considered that, when monochromatic X-rays impinge upon the atoms in a crystal lattice, each atom acts as a source of scattered radiation of the same wavelength?
W.H. Bragg
W.L. Bragg
A. Einstein
Collins and Reiling
An X-ray line of wave length 2.15328 Ao is found to be emitted to be emitted from an X-ray tube with zinc (Z=30) target in addition to the characteristic Ka line of zinc of wavelength 5.74412 Ao. If the unknown line is due to an impurity in the target, then the atomic number of the impurity is
30
40
49
56
An X-ray machine is operated at 80 kilo volts; the short wavelength limit of continuous X-ray is equal to
0.155 Ao
1.155 Ao
3.25 Ao
0.275 Ao
The energy of electron in the ground state of hydrogen atom is -13.6 eV and first excited state (n=2) is -3.4 eV. Therefore the resonance potential for hydrogen is
10.2 V
17.0 V
5.1 V
8.5 V
In Bragg’s law, if the path difference is an integral multiple of wavelength, the reflected beams will reinforce each other and_________ will occur between them.
Constructive interference
Destructive interference
Polarization
Diffraction
Consider the following statements: When a beam of monochromatic x-ray is scattered by carbon atoms, the scattered radiations consist of two components, one of longer wavelength and the other of the same wavelength as of the incident radiation. The difference in the wavelength is independent of the wavelength of the incident beam The difference in the wavelength is independent of nature of scattering elements. These statements are about
Compton effect
Photoelectric effect
Einstein Photo-electric equation
None of the above
The intensity of the reflected beam at certain angles will be_________ where the two reflected waves from two different planes have a phase difference equal to an intergral multiple of the wavelength of x-rays.
Minimum
Maximum
Equal
Zero
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Questions are on X-Rays , Bragg's law and Bohr's theory

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Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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