JEE PHYSICS UNIT 18
QUIZ NO 1
TOTAL QUESTIONS = 20


1. The energy of an electron in the nth orbit of a hydrogen atom is given by


2. The value of the ground state energy of hydrogen atom is


3. The radius of a hydrogen atom in the ground state is given by


4. The binding energy of a nucleus is


5. The angular momentum of an electron in the Bohr model of the atom is quantized as


6. What is the primary reason for the emission of radiation in the Bohr model of the atom?


7. The half-life of a radioactive substance is 10 years. After how much time, the substance decays to one-sixteenth of its initial quantity?


8. In the Bohr model of the hydrogen atom, the electron transitions from n=2 to n=1. The wavelength of the emitted radiation corresponds to


9. What is the energy of a photon in the visible region of the spectrum emitted by a hydrogen atom?


10. In a nuclear fission reaction, energy is released due to


11. The mass defect of a nucleus is the difference between


12. The radius of a nucleus is proportional to


13. What happens when an electron in a hydrogen atom jumps from the higher orbit to a lower orbit?


14. Which of the following phenomena occurs in both fission and fusion reactions?


15. In an alpha decay, the emitted particle consists of


16. What is the maximum number of electrons that can occupy the n=4 energy level in a hydrogen atom?


17. The ionization energy of the hydrogen atom is equal to


18. The process of electron capture in a nucleus results in


19. The radius of an atom is proportional to


20. The binding energy per nucleon is maximum for



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