原子物理_智慧树知到答案2021年

第七章 X ray：In 1895, Roentgen discovered X ray, which is the electromagnetic wave with high frequency. The spectrums of X ray have two kinds, continuous and characteristic ones, which are come from the bremsstrahlung and the inner electron transition, respectively. When the photon interacts with electron, its frequency will be changed. It is the Compton scattering and shows the light as particle. There many other ways about the photon-electron interactions, such as pair production, pair annihilation, photon absorption and so on.7.1The discovery of Xray:Rontgen discovered X ray in 1895
7.2The diffraction of Xray:The X ray is the electromagnetic wave from its diffraction experiment.
7.3The continuous spectrum:The continuous spectrum of X ray comes from the bremsstrahlung of electron.
7.4The characteristic spectrum:The transition of inner shell electrons generates the characteristic spectrum of X ray.
7.5Auger electron:The electron can escape from the atom in the production of X ray.
7.6Synchrotron Radiation:The synchrotron radiation is an advanced X ray with many advantages.
7.7Compton scattering:The frequency of light will be changed when it interacts with electron.
7.8Pair Production:In matter, when energy is enough, the photon can be transferred to electron and positron.
7.9Pair Annihilation:When electron and positron meet together, they will Annihilate.
7.10Photon absorption:The photon can be absorbed by matter.
7.11Exercise:There are several exercises about the interactions between photon and electron.

[单选题]Who discovered the X ray (  ).

选项:[Bohr, Einstein
, Rontgen
, Nobel
]
[单选题]A photon having 40 keV scatters from a free electron at rest. What is the maximum energy that the electron can obtain? (  )

选项:[7.95 eV
, 1.73 eV,  4.32 eV
, 5.41 eV
]
[单选题]A photon of wavelength 2.0 nm Compton-scatters from an electron at an angle of 90°. What is the modified wavelength? (    )

选项:[7.67945 nm
,  2.00243 nm
, 9.45891 nm, 5.56730 nm
]
[单选题]An X-ray tube operates at 100 kV. The maximum speed of electrons striking the anticathode is (    )

选项:[1.33 X10⁸ m/s, 1.19X10⁸ m/s
, 0.84 X10⁸ m/s, 1.88 X10⁸ m/s]
[单选题]The momentum of photons corresponding to the minimum wavelength emitted from x-ray tube whose operating voltage is 120 kV is (  )

选项:[6.396X10^-23 N·m
, 5.225X10^-23 N·m
, 4.175X10^-24 N·m
, 4.783X10^-14 N·m
]
[单选题]The continuum spectrum of X ray comes from  (   )

选项:[Auger electron
, Bremsstrahlung, Photoelectric effect
, Pair production
]
[单选题]When the atomic number of the anticathode is 79, the frequency of K_a line is  (    )

选项:[9.21X10¹⁹ s^-1
,  1.50X10¹⁹ s^-1, 4.57X10¹⁸ s^-1
, 2.24X10¹⁹ s^-1
]
[单选题]If we have a tungsten anode (work function  f=4.63 eV) and electron   acceleration voltage of 35 kV, what is the minimum wavelength of the x rays? (   )

选项:[3.12 pm
,  0.0354 nm
, 3.89 nm
, 4.58 fm
]
[单选题]In Zn the ionization energy of K shell is 9.659 KeV and L shell 1.021 KeV. The kinetic energy of the Auger electron emitted from the L shell is (   )

选项:[7.62 KeV
, 1.02 KeV
, 8.638 KeV
, 4.579 KeV]
[单选题]If the K, L, and M energy levels of Pt are 78000 eV, 12000 eV and 30000 eV, respectively, the wavelength of K_a line from Pt is   (  )

选项:[43.6 pm
, 14.3 pm
, 18.6 pm
, 92.6 pm
]