Atoms and Nuclei (NEET Physics): Questions 63 - 67 of 67

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Question number: 63

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

10 In the nuclear reaction,

U92238ThZA+He24

the values of A and Z are-

Choices

Choice (4) Response

a.

A = 234, Z = 94

b.

A = 238, Z = 90

c.

A = 234, Z = 90

d.

A = 238, Z = 94

Question number: 64

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

In the disintegration series

92235UαXβZAY

The value of Z and A respectively will be,

Choices

Choice (4) Response

a.

90, 234

b.

91, 231

c.

88, 230

d.

92, 240

Question number: 65

» Atoms and Nuclei » Mass Defect

MCQ▾

Question

If the mass defect in the formation of helium from hydrogen is 0.5%, then the energy obtained, in kWh, in forming helium from 1 kg of hydrogen will be,

Choices

Choice (4) Response

a.

1.25

b.

125 ⨯ 10 4

c.

1.25 ⨯ 10 8

d.

1.25 ⨯ 10 6

Question number: 66

» Atoms and Nuclei » Radioactivity

Appeared in Year: 2016

MCQ▾

Question

The half – life of a radioactive substance is 30minutes . The time (in minutes) taken between 40 % decay and 85 % decay of the same radioactive substance is:

Choices

Choice (4) Response

a.

60

b.

30

c.

15

d.

45

Question number: 67

» Atoms and Nuclei » Hydrogen Spectrum

Appeared in Year: 2016

MCQ▾

Question

If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength λ . When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be –

Choices

Choice (4) Response

a.

916λ

b.

2013λ

c.

1625λ

d.

207λ

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