## ATOMS QUIZ-10

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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. One of the lines in the emission spectrum of Li(2+) has the same wavelength as that of the 2nd line of Balmer series in hydrogen spectrum. The electronic transition corresponding to this line is
•  n=4→n=2
•  n=8→n=2
•  n=8→n=4
•  n=12→n=6
Solution

Q2. The wavelength of the first line of Balmer series is 6563 â„«. The Rydberg’s constant is
•  1.09×105 per m(-1)
•  1.09×106 per m(-1)
•  1.097×107 per m(-1)
•  1.09×108 per m(-1)
Solution

Q3. A hydrogen atom and a Li(++) ion are both in the second excited state. If lH and lLI are their respective electronic angular momenta, and EH and ELi their respective energies, then
•   lH<lLI and |EH |>|ELI |
•  lH=lLI and |EH | < |ELI |
•  lH=lLI and |EH |>|ELI |
•  lH < lLI and |EH |<|ELI |
Solution

Q4. Given: mass number of gold = 197, density of gold= 19.7 g cm(-3), Avogadro’s number =6×1023. The radius of the gold atom is approximately:
•  1.5×10(-8) m
•  1.5×10(-9) m
•  1.5×10(-10) m
•  1.5×10(-12) m
Solution
(c)

Q5. Magnetic field at the center (at nucleus) of the hydrogen-like atoms (atomic number =z) due to the motion of electron in n^th orbit is proportional to
•  n3/z5
•  n4/z
•  z2/n3
•  z3/n5
Solution

Q6. The recoil speed of a hydrogen atom after it emits a photon in going from n=5 state to n=1 state is
•  4.718 ms(-1)
•  7.418 ms(-1)
•  4.178 ms(-1)
•  7.148 ms(-1)
Solution

Q7. The wavelength KÎ± of X-rays produced by the X-ray tube is 0.76 â„«. The atomic number of the node material of the tube is
•  30
•  40
•  50
•  60
Solution

Q8. The force acting on the electron in a hydrogen atom depends on the principal quantum number as
•  F∝n2
•  F∝1/n2
•  F∝n4
•  F∝1/n4
Solution

Q9. As the quantum number increases, the difference of energy between conservative energy levels:
•  Decreases
•  Increases
•  First decreases and then increases
•  Remain the same
Solution

Q10. If 10,000 V are applied across an X-ray tube, find the ratio of wavelength of the incident electrons and shortest wavelength of X-ray coming out of the X-ray tube, given e/m, of electron =1.8×1011 C kg(-1)
•  1:10
•  10:1
•  5:1
• 1:5
Solution

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