Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 39

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Weekly Quiz Competition

Question 1
4 / -1

The ratio of the energies of the hydrogen atom in its first to second excited state is

A
1/4

B
4/9

C
9/4

D
4

Solution
Question 2
4 / -1

An electron jumps from the 4^th orbit to the 2^nd orbit of hydrogen atom. Given the Rydberg\'s constant R = 10⁵ cm^-1. The frequency in Hz of the emitted radiation will be

A

B

C

D

Solution
Question 3
4 / -1

According to Bohr\'s theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to

A

B

C

D

Solution
Question 4
4 / -1

The radius of electron\'s second stationary orbit in Bohr\'s atom is R. The radius of the third orbit will be

A
3 R

B
2.25R

C
9R

D

Solution
Question 5
4 / -1

In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron is

A
1/2

B
2

C
–1/2

D
–2

Solution
Question 6
4 / -1

Figure shows the energy levels P, Q, R, S and G of an atom where G is the ground state. A red line in the emission spectrum of the atom can be obtained by an energy level change from Q to S. A blue line can be obtained by following energy level change

A
P to Q

B
Q to R

C
R to S

D
R to G

Solution
Question 7
4 / -1

The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g., line no. 5 arises from the transition from level B to A). Which of the following spectral lines will also occur in the absorption spectra?

A
1, 4, 6

B
4, 5, 6

C
1, 2, 3

D
1, 2, 3, 4, 5, 6
Question 8
4 / -1

When a hydrogen atom is raised from the ground state to an excited state

A
P.E. increases and K.E. decreases

B
P.E. decreases and K.E. increases

C
Both kinetic energy and potential energy increase

D
Both K.E. and P.E. decrease

Solution
Question 9
4 / -1

An electron makes a transition from orbit n = 4 to the orbit n = 2 of a hydrogen atom. The wave number of the emitted radiations (R = Rydberg\'s constant) will be

A

B

C

D

Solution
Question 10
4 / -1

In Bohr model of the hydrogen atom, the lowest orbit corresponds to

A
Infinite energy

B
The maximum energy

C
The minimum energy

D
Zero energy