Atoms and Nuclei [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 3 of 149
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Question 1
Question MCQ▾
In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a0 is the radius of the ground state orbit, m is the mass, e is the charge on the electron and s0 is the vacuum permittivity, the speed of the electron is
Choices
Choice (4) | Response | |
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a. | ||
b. | ||
c. | ||
d. |
Question 2
Question MCQ▾
The electron in a hydrogen atom makes a transition , where n1 and n2 are the principal quantum numbers of two states. Assume the Bohr model to be valid. The time period of the electron in the initial state is eight times that in the final state. Then,
(1) n1 = 4 (2) n2 = 2
(3) n2 = 5 (4) n1 = 5
Select the correct answers and mark it according to the following codes:
Choices
Choice (4) | Response | |
---|---|---|
a. | 1 and 2 are correct | |
b. | 1,2 and 3 are correct | |
c. | 1 and 3 are correct | |
d. | 2 and 4 are correct |
Question 3
Question MCQ▾
In figure the energy level diagram of an atom with one electron knocked out is shown. Which of the following relation is true?
( is frequency of Kβ X-ray of a material, is frequency of Kα X-ray of same material and is the frequency of Lα X-ray of same material)
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |