Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 101

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Weekly Quiz Competition

Question 1
4 / -1

The energy of a hydrogen atom in the ground state is –13.6eV. The energy of a He⁺ ion in the first excited state will be

A
– 6.8 eV

B
– 13.6 eV

C
– 27.2 eV

D
– 54.4 eV

Solution
Question 2
4 / -1

Which of these is non-divisible?

A
Nucleus

B
Photon

C
Proton

D
Atom
Question 3
4 / -1

An electron in the n =1 orbit of hydrogen atom is bounded by 13.6eV. Energy requires to ionize it is

A
13.6 eV

B
6.43 eV

C
5.4 eV

D
1.51 eV
Question 4
4 / -1

Ionization energy of hydrogen is 13.6 eV. If h = 6.6 × 10^–34J – s, the value of R will be of the order of

A
10¹⁰m^–1

B
10⁷m^–1

C
10⁴m^–1

D
10^–7m^–1

Solution
Question 5
4 / -1

To explain his theory, Bohr used

A
Conservation of linear momentum

B
Conservation of angular momentum

C
Conservation of quantum frequency

D
Conservation of energy
Question 6
4 / -1

The ionization energy of hydrogen atom is 13.6 eV. Following Bohr\'s theory, the energy corresponding to a transition between the 3rd and the 4th orbit is

A
3.40 eV

B
1.51 eV

C
0.85 eV

D
0.66 eV

Solution
Question 7
4 / -1

An alpha nucleus of energy 1/2mv²bombards a heavynuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to

A
1/m

B
1 /v⁴

C
1 /Ze

D
v²

Solution
Question 8
4 / -1

The radius of hydrogen atom in its ground state is 5.3 × 10^–11m. After collision with an electron it is found to have a radius of 21.2 × 10^–11m. What is the principal quantum number n of the final state of the atom?

A
n = 4

B
n = 2

C
n =16

D
n = 3

Solution
Question 9
4 / -1

The splitting of line into groups under the effect of magnetic field is called

A
Zeeman's effect

B
Bohr's effect

C
Heisenberg's effect

D
Magnetic effect
Question 10
4 / -1

The energy of a hydrogen atom in its ground state is –13.6 eV. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is

A
– 2.72 eV

B
– 0.85 eV

C
– 0.54 eV

D
– 3.4 eV

Solution