Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 80

Score
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Weekly Quiz Competition

Question 1
4 / -1

A

B

C

D

Solution
Question 2
4 / -1

In a beryllium atom, if a₀ be the radius of the first orbit, then the radius of the second orbit will be in general

A

B

C

D

Solution
Question 3
4 / -1

Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spertral series which has an upper limit of wavelength equal to 18752 Å is
(Rydberg constant R = 1.097 × 10⁷ per metre)

A
Balmer series

B
Lyman series

C
Paschen series

D
Pfund series

Solution
Question 4
4 / -1

The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, emitting a photon of wavelength λ. The wavelength

A
λ/3

B
3 λ/4

C
4 λ/3

D
3 λ

Solution
Question 5
4 / -1

A beam of fast moving alpha particles were directed towards a thin film of gold. The parts A’, B’ and C’ of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam, are shown in the adjoining diagram. The number of alpha particles in

A
B’ will be minimum and in C’ maximum

B
A’ will be maximum and in B’ minimum

C
A’ will be minimum and in B’ maximum

D
C’ will be minimum and in B’ maximum
Question 6
4 / -1

Consider an electron in the n^th orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of the de Broglie wavelength λ of that electron as

A
(0.259)nλ

B

C
(13.6)λ

D
nλ

Solution
Question 7
4 / -1

An electron of an atom transits from n₁ to n₂. In which of the following maximum frequency of photon will be emitted?

A
n₁ = 1 to n₂ = 2

B
n₁ = 2 to n₂ = 1

C
n₁= 2 to n₂ = 6

D
n₁= 6 to n₂ = 2
Question 8
4 / -1

Which of the following statements about the Bohr model of the hydrogen atom is false?

A
Acceleration of electron in n = 2 orbit is less than that in n =1 orbit

B
Angular momentum of electron in n = 2 orbit is more than that in n =1 orbit

C
Kinetic energy of electron in n = 2 orbit is less than that in n =1 orbit

D
potential energy of electron in n = 2 orbit is less than that in n =1 orbit
Question 9
4 / -1

The Rydberg constant R for hydrogen is

A

B

C

D

Solution
Question 10
4 / -1

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a₀ is the radius of the ground state orbit, m is the mass, e is the charge on the electron and ε₀ is the vacuum permittivity, the speed of the electron is

A
0

B

C

D

Solution