## ATOMS QUIZ-5

JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q1. The ratio (in S.I. units) of magnetic dipole moment to that of the angular momentum of an electron of mass m kg and charge e coulomb in Bohr’s orbit of hydrogen atom is
•  e/2m
•  e/m
•  2e/m
•  None of these
Solution

Q2. An electron in a hydrogen atom makes a transition from first excited state to ground state. The equivalent current due to circulating electron:
•   Increases 2 times
•  Increases 4 times
•  Increases 8 times
•  Remains the same
Solution

Q3. If potential energy between a proton and an electron is given by |U|=ke^2/2R^3, where e is the charge of electron and R is the radius of atom, then radius of Bohr’s orbit is given by (h= Planck’s constant, k= constant)
•   (ke2m)/h2
•  (6Ï€2)/n2(ke2m)/h2
•  2Ï€/n(ke2 m)/h2
•  (4Ï€2ke2m)/(n2h2 )
Solution

Q4. The power of an X-ray tube is 16 W. If the potential difference applied across the tube is 5 kV, then the number of electron striking the target per second is
•  8.4×1016
•  5×1017
•  2×1016
•  2×1019
Solution

Q5. An electron in H atom makes a transition from n=3 to n=1. The recoil momentum of H atom will be
•  6.45×10(-27) N s
•  6.8×10(-27) N s
•  6.45×10(-24) N s
•  6.8×10(-24) N s
Solution

Q6. The potential energy of an electron in the fifth orbit of hydrogen atom is
•  0.54eV
•  -0.54 eV
•  1.08 eV
•  -1.08 eV
Solution

Q7. The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is
•  802 nm
•  823 nm
•  1882 nm
•  1648 nm
Solution

Q8. The radius of the Bohr orbit in the ground state of hydrogen atom is 0.5 â„«. The radius of the orbit of the electron in the third excited state of He^+ will be
•  8 â„«
•  4 â„«
•  0.5 â„«
•  0.25 â„«
Solution

Q9. When an electron jumps from n1th orbit to n2th orbit, the energy radiated is given by
•  hv=E1/E2
•  hv=E2/E1
•  hv=E1-E2
•  hv=E2-E1
Solution
(c) This is Bohr’ postulate

Q10. The voltage applied to an X-ray tube is 18 kV. The maximum mass of photon emitted by the X-ray tube will be
•  2×10(-13) kg
•  3.2×10(-36) kg
•  3.2×10(-32) kg
• 9.1×10(-31) kg
Solution

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Atoms - Quiz 5