Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 72

Score
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Weekly Quiz Competition

Question 1
4 / -1

The distance of the closest approach of an alpha particle fired at a nucleus with kinetic energy K is r_o. The distemce of the closest approach when the α -particle is fired at the same nucleus with kinetic energy 2k will be.

A

B

C

D

Solution
Question 2
4 / -1

which of the following series in the spectrum of hydrogen ion lies in the visible region of the electron magnetic spectrum?

A
Paschen

B
Lyman

C
Brakett

D
Balmer
Question 3
4 / -1

If 13.6 eV energy is required to ionige the hydrogen atom the energy required to remove the electron form n = 2 state is

A
Zero

B
10.2 eV

C
6.8 eV

D
3.4 eV

Solution
Question 4
4 / -1

It N_o is the original mass of the substance of halt lift 5 years, the amount of substance left after 15 years is

A

B

C

D

Solution
Question 5
4 / -1

At a certain instant, a radioactive sample has a decay rate of 5000 dis-interation Per minute. After 5 minuter the decay rate is 1250 dis-interations Per minute. Then the decay constant is (Per-min )

A
0.2 ln 4

B
0.4 ln 4

C
0.4 ln 2

D
0.8 ln 2

Solution
Question 6
4 / -1

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

A
76

B
78

C
74

D
82

Solution
Question 7
4 / -1

which of the following can not be emitted in radioactive decay of the substance?

A
Helium-nucleus

B
Electrons

C
Neutrions

D
Proton
Question 8
4 / -1

A
8 fm

B
6 fm

C
4 fm

D
5 fm

Solution
Question 9
4 / -1

which of the following atom has the lowest ionisation potential?

A

B

C

D

Solution
Question 10
4 / -1

If the binding energy of electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron form the first state of Li²⁺ is.

A
13.6 eV

B
30.6 eV

C
122.4 eV

D
3.4 eV

Solution