Q.1
The X-ray beam coming from an X-ray tube will be [ IIT 1985]
  • a) Monochromatic
  • b) Haing all wavelengths smaller than a certain maximum wavelength
  • c) Having all wavelengths larger than a certain minimum wavelength
  • d) HAving all wavelengths lying between a minimum and maximum wavelength
Q.2
What happens when fast moving electrons are stopped and fall on the metallic target in an evacuated glass bulb [ MPPMT 1997]
  • a)β particles are produced
  • b) Metal become soft
  • c)γ rays are produced
  • d)X-rays are produced
Q.3
X ray is ...[ CPMT 1999]
  • a) Phenomenon of conservation of Kinetic energy into radiation energy
  • b) Conservation of momentum
  • c)Conservation of mass into energy
  • d)principal of conservation of charge
Q.4
Bragg's equation will not have solution if ....
  • a) λ > 2d
  • b)λ < 2d
  • c)λ < d
  • d)λd
Q.5
Kα characteristic X-ray refers to the transition ..[ MPPMT 1999]
  • a) n=2 to n=1
  • b) n=3 to n=2
  • c) n=3 to n=1
  • d) n=4 to n=2
Q.6
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation [ ISM Dhanbad]
  • a)the intensity increases
  • b) the minimum wavelength increases
  • c)the maximum wavelength increases
  • d)the minimum wavelength decreases but intensity remains same
Q.7
When a beam of accelerated electrons hits a target which of the following wavelengths is absent in the X-ray region of spectrum, if the X-ray tube is operating at 40000 volt [ MNR 1995]
  • a) 1.5 Å
  • b) 0.5 Å
  • c)0.25 Å
  • d)1.0 Å
Q.8
The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40 KeV electrons, is approximately... [MPPMT 1999]
  • a) 300 Å
  • b)10 Å
  • c)4 Å
  • d)0.31 Å
Q.9
The ratio of the energy of an X-ray photon of wavelength 1 Å to that of visible light of wavelength 5000 Å is [ EAMCET 1995]
  • a) 1 : 5000
  • b) 5000 : 1
  • c) 1 : 25 ×106
  • d) 25 × 106
Q.10
The frequency of Kα line for an element of Z=64 is Vα and that for an element Z=80 is v'α. The ratio of frequencies of Kα lines of these elements is
  • a) √(2/5)
  • b) 2/√5
  • c)16/25
  • d)2/5
Q.11
The wavelength of Kα lines given by molybdenum ( atomic number=42) is 0.7078Å then wavelength of Kα for zinc ( atomic number 30) will b [ raj. PET 1997]
  • a) 0.354 Å
  • b) 1.4147 Å
  • c)09425 Å
  • d)1.2547 Å
Q.12
Velocity of photon is proportional to [ CBSE 1996] ν is frequency
  • a) ν
  • b) ν1/2
  • c)ν-1/2
  • d) ν0
Q.13
For photoelectric emission from certain metal the cut-off frequency is ν. If radiation of frequency 2ν impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)…[NEET 2013]
  • a)
    ch-9_qn-313choice_img_no1.png
  • b)
    ch-9_qn-313choice_img_no2.png
  • c)
    ch-9_qn-313choice_img_no3.png
  • d)
    ch-9_qn-313choice_img_no4.png
Q.14
The wavelength λe of an electron and λp of aphoton of same energy E are related by
  • a)
    ch-9_qn-314choice_img_no1.png
  • b)
    ch-9_qn-314choice_img_no2.png
  • c)
    ch-9_qn-314choice_img_no3.png
  • d)
    ch-9_qn-314choice_img_no4.png
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