Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 35

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Weekly Quiz Competition

Question 1
4 / -1

The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition

A
2 → 1

B
3 → 2

C
4 → 2

D
5 → 4
Question 2
4 / -1

The electron emitted in beta radiation originates from

A
inner orbits of atoms

B
free electrons existing in nuclei

C
decay of a neutron in a nucleus

D
photon escaping from the nucleus
Question 3
4 / -1

An isobar is produced in

A
β-emission

B
α-emission

C
proton emission

D
deutron emission
Question 4
4 / -1

A
92, 236

B
88, 230

C
90, 234

D
91, 234

Solution
Question 5
4 / -1

Two deutrons each of mass m fuse to form helium resulting in release of energy E. The mass of helium formed is

A
m + E/c²

B
2m + E/c²

C
E/mc²

D
2m – E/c²
Question 6
4 / -1

Wavelength in a spectrum is inversely proportional to

A
difference in energy levels

B
velocity of electrons

C
number of electrons

D
none of these

Solution
Question 7
4 / -1

A nucleus with Z = 92 emits the following in a sequence: α, β^–, β^–, α, α, α, α, α, β^–, β^–, α, β⁺, β⁺ and α.
The Z of the resulting nucleus is

A
76

B
78

C
82

D
74
Question 8
4 / -1

Which of the following cannot be emitted by radioactive substances during their decay?

A
Proton

B
Helium nucleus

C
Electron

D
Neutrino
Question 9
4 / -1

Which of the following atoms has the lowest ionization potential?

A
₇N¹⁴

B
₅₅Cs¹³³

C
₁₈Ar⁴⁰

D
₈O¹⁶

Solution
Question 10
4 / -1

The electric potential between a proton and an electron is given by V = V₀ (r/r₀), where r₀ is a constant. Assuming Bohr’s model to be applicable, write variation of r_n with n, n being the principal quantum number?

A
r_n ∝ n

B

C
r_n ∝ n²

D