Atoms and Nuclei-Bohr Model (NEET Physics): Questions 1 - 3 of 9

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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 » Bohr Model

MCQ▾

Question

If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr’s first postulate, the kinetic energy K=12mv2 of the electron in C. G. S system is equal to.

Choices

Choice (4) Response

a.

12Ze2r2

b.

Zer2

c.

Ze2r

d.

12Ze2r

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