Atoms and Nuclei-Bohr Model (NEET Physics): Questions 4 - 9 of 9

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Question number: 4

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number?

Choices

Choice (4) Response
a.

RE

b.

Ev

c.

vR

d.

RE

Question number: 5

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy E 0 and the radius r 0 of the first orbit will be (a 0 is the Bohr radius)

Choices

Choice (4) Response
a.

E0=13.6eV;r0=a02

b.

E0=27.2eV;r0=a02

c.

E0=27.2eV;r0=a0

d.

E0=13.6eV;r0=a0

Question number: 6

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

According to Bohr’s theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be,

Choices

Choice (4) Response
a.

2πh

b.

πh

c.

hπ

d.

πh

Question number: 7

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

The value of the kinetic energy divided by the total energy of an electron in a Bohr orbit is

Choices

Choice (4) Response
a.

2

b.

-1

c.

0.5

d. All of the above

Question number: 8

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

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.

122.4

b.

40.8

c.

1.51

d.

13.6

Question number: 9

» Atoms and Nuclei » Bohr Model

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. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
b. Ꭺ is false but Ꭱ is true
c. Ꭺ is true but Ꭱ is false
d. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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