Atoms and Nuclei (NEET Physics): Questions 1 - 3 of 67

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Question number: 1

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a 0 is the radius of the ground state orbit, m is the mass, e is the charge on the electron and s 0 is the vacuum permittivity, the speed of the electron is

Choices

Choice (4) Response

a.

4πε0a0me

b.

eε0a0m

c.

e4πε0a0m

d.

0

Question number: 2

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

The electron in a hydrogen atom makes a transition n1n2 , where n 1 and n 2 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) n 1 = 4 (2) n 2 = 2

(3) n 2 = 5 (4) n 1 = 5

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 3

» Atoms and Nuclei » Energy Levels

MCQ▾

Question

In figure the energy level diagram of an atom with one electron knocked out is shown. Which of the following relation is true?

( νkβ is frequency of K β X-ray of a material, νkα is frequency of K α X-ray of same material and νLα is the frequency of L α X-ray of same material)

Finding the correct relationship of the energy level diagram

Finding the Correct Relationship of the Energy Level Diagram

Energy level diagram of an atom with one electron knocked out is shown

Choices

Choice (4) Response

a.

νkβ=(νkα+νLα)2

b.

νkβ=νkα+νLα

c.

νkβ=νkα2+νLα2

d.

νkβ=νkα2+νLα2

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