Atoms and Nuclei [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 28 - 32 of 149
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Question 28
Question MCQ▾
When a hydrogen atom is raised from the ground state to an excited state
Choices
Choice (4) | Response | |
---|---|---|
a. | P. E. decreases and K. E. increases | |
b. | K. E. and P. E. decrease | |
c. | kinetic energy and potential energy increase | |
d. | P. E. increases and K. E. decreases |
Question 29
Question MCQ▾
As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is
Choices
Choice (4) | Response | |
---|---|---|
a. | 13.6 | |
b. | 40.8 | |
c. | 122.4 | |
d. | 1.51 |
Question 30
Question Assertion-Reason▾
Assertion(Ꭺ)
Bohr postulated that the electrons in stationary orbits around the nucleus do not radiate energy.
Reason(Ꭱ)
According to classical physics all moving electrons radiate energy.
Choices
Choice (4) | Response | |
---|---|---|
a. | Ꭺ is false but Ꭱ is true | |
b. | Ꭺ is true but Ꭱ is false | |
c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
d. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
Question 31
Question MCQ▾
The Lyman series of hydrogen spectrum lies in the region
Choices
Choice (4) | Response | |
---|---|---|
a. | Infrared | |
b. | Ultraviolet | |
c. | Visible | |
d. | X-rays |
Question 32
Question MCQ▾
If mass equivalent to one mass of electron is completely converted into energy then determine the energy liberated.
Choices
Choice (4) | Response | |
---|---|---|
a. | 0.51 MeV | |
b. | 2.12 MeV | |
c. | 1.51 MeV | |
d. | 3.12 MeV |