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85431The work function for the photoelectric effect in potassium is 2.25 eV.For the case when light with a wavelength of 3.6 x 10-7 ；m falls on the potassium， the velocity of the fastest of the emitted electrons is（）

85432The de Broglie wavelength of an electron with kinetic energy of 100 keV is（）

85433How many lines can be expected for the 32D->；32P transition in sodium？（）

85434The angle between the total and the orbital angular momenta in a 4D3/2 state is（）

85435The Lande factor of 4D1/2； state is（）；

85436How large is the magnetic field generated by the electron in the ground state of a hydrogen atom， at the position of the proton if it would circulate according to Bohr model on the shell n = 1？（）

85437On which of the following states of hydrogen the spin-orbit interaction has no effect？（）

85438The energy of a hydrogen atom in the first excited state is（）

85439Through what angle is a 4 MeV a particle scattered when it approaches a gold nucleus with a impact parameter of 2.6 X 10-13 m？（）。

85440Liquid helium（atomic weight 4.003） has a density r= 0.13 g/cm3.Estimate the radius of a He atom， assuming that the atoms are packed in the densest possible configuration， which fills 74% of the space.（）。

85441In 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（）

85442When the atomic number of the anticathode is 79， the frequency of Ka line is（）

85443If the K， L， and M energy levels of Pt are 78000 eV， 12000 eV and 30000 eV， respectively， the wavelength of Ka line from Pt is（）

85444An X-ray tube operates at 100 kV.The maximum speed of electrons striking the anticathode is（）

85445The momentum of photons corresponding to the minimum wavelength emitted from x-ray tube whose operating voltage is 120 kV is（）

85446A photon of wavelength 2.0 nm Compton-scatters from an electron at an angle of 90°.What is the modified wavelength？（）

85447A photon having 40 keV scatters from a free electron at rest.What is the maximum energy that the electron can obtain？（）

85448The continuum spectrum of X ray comes from（）

85449If 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？（）

85450Who discovered the X ray（）.

85451How many electrons can be contained in M shell（）

85452What atoms have the configuration 1s22s22p63s2（）

85453A.5

85454The electron configuration of Neon is（）

85455A system of electrons is described by a wave function should be（）

85456The ground state of carbon is（）

85457The 3s state of Na has an energy of -5.14 eV.Its effective nuclear charge is（）

85458The number of values allowed to total angular momentum j in Helium atom for a given non-zero l are（）

85459The maximum value of total angular momentum for electron with l=4（）

85460The total spin of two electrons is（）.

85461An atom with the states 2G9/2 and 2H11/2 is placed in a weak magnetic field.How many transitions can be observed？（）

85462In anomalous Zeeman effect， a level of give， s， l， j splits into（）

85463A sample of a certain element is placed in a 0.300 T magnetic field and suitably excited.How far apart are the Zeeman components of the 450 nm spectral line of this element？（）

85464The Bohr magneton is（）；

85465An energy difference of 4×10-3 eV for the 3p subshell of sodium accounts for the how many splitting of a spectral line at 589.3 nm is（）

85466The Lande factor of 2S1/2 is（）

85467An experimenter wants to separate silver atoms in a Stern-Gerlach experiment by at least 1 cm（a large separation） as they exit the magnetic field.To heat the silver， she has an oven that can reach 1000°C and needs to order a suitable magnet.What should be

85468A.7.40×10-23 J

85469For a hydrogen atom in the 6f state， the minimum angle between the orbital angular momentum vector and the z axis is（）

85470An electron whose orbital quantum number is 2 has the length of angular momentum（）.

85471A.0.0251

85472The average value of 1/r for a 1s electron in the hydrogen atom is（）

85473The expectation value <；x>； of the position of a particle trapped in a box L wide of infinite well is（）

85474A measurement establishes the position of a proton with an accuracy of 1.00 í10-11 m.The uncertainty in the proton’s position 1.00 s later is（）

85475The experiment that confirms the existence of de Broglie waves is（）

85476The kinetic energy of a proton whose de Broglie wavelength is 1.0 fm is（）

85477The de Broglie wavelengths of a 46 g golf ball with a velocity of 30 m/s is（）

85478A metal surface illuminated by 8.5×1014 Hz light emits electrons whose maximum energy is 0.52 eV.The same surface illuminated by 12.0×1014 Hz light emits electrons whose maximum energy is 1.97 eV.The work function of the metal is（B ）。

85479Ultraviolet light of wavelength 350 nm and intensity 1.00 W/m2 is directed at a potassium surface.The maximum kinetic energy of the photoelectrons is（）

85480The energy quanta of an atomic oscillator that emits and absorbs orange light whose frequency is 5.00 ×1014 Hz is.（）.

85481What is the shortest wavelength present in the Brackett series of spectral lines？（）

85482The longest wavelength in the Lyman series is 121.5 nm and the shortest wavelength in the Balmer series is 364.6 nm.Find the longest wavelength of light that could ionize hydrogen.（）

85483A beam of electrons bombards a sample of hydrogen.Through what potential difference must the electrons have been accelerated if the first line of the Balmer series is to be emitted？（）

85484A proton and an electron， both at rest initially， combine to form a hydrogen atom in the ground state.A single photon is emit- ted in this process.What is its wavelength？（）

85485If the electron in hydrogen atom jumps from the third orbit to second orbit， the wavelength of th emitted radiation is given by（）

85486The ratio of the speed of the electron in the ground state of hydrogen atom to the speed of light is（）

85487In hydrogen atom the angular momentum of the electron in the lowest energy state（）

85488According to Bohr model of hydrogen atom， the radius of stationary obit characterized by the principal quantum number n is proportional（）

85489What determines the difference in energy between two energy levels？（）

85490When an electron jumps from its orbit to another orbit， energy is（）.

85491What fraction of a beam of 7.7-MeV alpha particles incident upon a gold foil 3.0×10-7 m thick is scattered by less than 1°？（）

85492A 5.0-MeV alpha particle approaches a gold nucleus with an impact parameter of 2.6×10-13 m.Through what angle will it be scattered？（）

85493Which of the following is not a valid conclusion from Rutherford’s alpha particle scattering experiment？（）

85494According to structure of atom electron should fall in（）？

85495For an 8.0-MeV α particle scattering from a gold atom（Z = 79 ） of radius 0.135 nm， the largest scattering angle， θ is ？（）

85496For aluminum（Z2 = 13） and gold（Z2 = 79 ）targets， what is the ratio of α particle scattering at any angle for equal numbers of scattering nuclei per unit area？（）

85497In Rutherford atomic model alpha particles were stroked on（）

85498The mass of a proton is（）

85499The mass of a single iron atom is 9.3 × 10–23 g.Determine the number if iron atoms in regular cube that measures exactly 10 cm on an edge.The density of iron is 7.86 g/cm3（）。

85500State the mass of Avogadro’s number of atoms for Copper（）.

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