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

Edit

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

Edit

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

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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

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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

Edit