Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 3

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Weekly Quiz Competition

Question 1
4 / -1

The ratio of areas of the electron orbits for the first excited state and the ground state for the hydrogen atom is

A
4 : 1

B
16 : 1

C
8 : 1

D
2 : 1
Question 2
4 / -1

Which of the following lines of the H–atom spectrum belongs to the Balmer series?

A
1025 Å

B
1218 Å

C
3646 Å

D
18751 Å
Question 3
4 / -1

The ratio of kinetic energy and the total energy of the electron in the nth quantum state of Bohr's atomic model of hydrogen atom is

A
-2

B
-1

C
+2

D
+1

Solution
Question 4
4 / -1

The first excitation potential of a given atom is 10.2 V. Then, ionisation potential must be

A
20.4 V

B
13.6 V

C
30.6 V

D
40.8 V

Solution
Question 5
4 / -1

The ratio of minimum to maximum wavelength in Balmer series is

A
5 : 9

B
5 : 36

C
1 : 4

D
3 : 4
Question 6
4 / -1

The ground state energy of hydrogen atom is i 3.6 eV. When its electron is in the first excited state, its excitation energy is

A
3.4 eV

B
6.8 eV

C
10.2 eV

D
Zero

Solution
Question 7
4 / -1

Solar spectrum is an example for

A
line emission spectrum

B
continuous emission spectrum

C
band absorption spectrum

D
line absorption spectrum
Question 8
4 / -1

In the Bohr model of hydrogen atom, the electron is pictured to rotate in a circular orbit of radius 5 × 10^-11 m, at a speed 2.2 × 10⁶ ms^-1 . What is the current associated with electron motion?

A
1.12 mA

B
3 mA

C
0.75 mA

D
2.25 mA

Solution
Question 9
4 / -1

The ionisation potential of hydrogen atom is –13.6 eV. An electron in the ground state of a hydrogen atoms absorbs a photon of energy 1275 eV. How many different spectral line can one expect when the electron make a downward transition?

A
1

B
4

C
2

D
6
Question 10
4 / -1

First Bohr radius of an atom with Z = 82 is R. Radius of its third orbit is

A
9R

B
6R

C
3R

D
R