Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 12

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Weekly Quiz Competition

Question 1
4 / -1

Assuming the mass of earth as, 6.64 × 10²⁴ kg and the average mass of the atoms that makes up earth as 40 u (atomic mass unit), the number of atoms in the earth is approximately

A
10³⁰

B
10⁴⁰

C
10⁵⁰

D
10⁶⁰

Solution
Question 2
4 / -1

Radius of ₂He⁴ nucleus is 3 Fm. The radius of ₈₂Pb²⁰⁶ nucleus will be

A
5 Fm

B
6 Fm

C
11.16 Fm

D
8 Fm
Question 3
4 / -1

Number of neutrons in C¹² and C¹⁴ are

A
8 and 6

B
6 and 8

C
6 and 6

D
8 and 8
Question 4
4 / -1

An a nucleus of energy 1/2 mv² bombards a heavy nuclear target of charge Ze. Then, the distance of closest approach for the alpha nucleus will be proportional to

A
v²

B
1/m

C
1/v⁴

D
1/Ze

Solution
Question 5
4 / -1

Hydrogen (₁H¹), deuterium (₁H²), singly ionised helium (₂He⁴)⁺ and doubly ionised lithium (₃Li⁸)⁺⁺ all have one electron around the nucleus. Consider an electron transition from n = 2 ton =1. If the wavelengths of emitted are λ₁, λ₂, λ₃, ans λ₄, respectively for four elements, then approximately which one of the following is correct?

A
4λ₁ = 2λ₂ = 2λ₃ = λ₄

B
λ₁ = 2λ₂ = 2λ₃ = λ₄

C
λ₁ = λ₂ = 4λ₃ = 9λ₄

D
λ₁ = 2λ₂ = 3λ₃ = 4λ₄
Question 6
4 / -1

A proton and an α–particle, accelerated through the same potential difference, enter a region of uniform magnetic field normally. If the radius of the proton orbit is 10 cm, then radius of α–particle is

A
10 cm

B
10√2 cm

C
20 cm

D
5√2 cm
Question 7
4 / -1

Which of the following spectral series of hydrogen atom is lying in visible range of electromagnetic wave?

A
Paschen series

B
Pfund series

C
Lyman series

D
Balmer series
Question 8
4 / -1

What is the energy of the electron revolving in third orbit expressed in eV'?

A
1.51 ev

B
3.4 ev

C
4.53 ev

D
4 ev

Solution
Question 9
4 / -1

The radius of the first orbit of hydrogen is r_H, and the energy in the ground state is –13.6 eV. Considering a μ^- -particle with a mass 207 m_e revolving round a proton as in hydrogen atom, the energy and radius of proton and μ^- -combination respectively in the first orbit are (assume nucleus to be stationary).

A

B

C

D

Solution
Question 10
4 / -1

If the radius of a nucleus with mass number 125 is 1.5 Fm, then radius of a nucleus with mass number 64 is

A
0.48 Fm

B
0.96 Fm

C
1.92 Fm

D
1.2 Fm

Solution