# The ionisation energy of a hydrogen atom is $$13.6~\text{eV}$$. Following Bohr's theory, what is the energy corresponding to a transition between the $$3^{th}$$ and $$4^{th}$$ orbit? 1. $$3.40~\text{eV}$$ 2. $$1.51~\text{eV}$$ 3. $$0.85~\text{eV}$$ 4. $$0.66~\text{eV}$$

Subtopic:  Bohr's Model of Atom |
71%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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

1. $\frac{1}{4}$

2. $\frac{4}{9}$

3. $\frac{9}{4}$

4. 4

Subtopic:  Bohr's Model of Atom |
61%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Energy levels A, B, C of a certain atom correspond to increasing values of energy i.e. ${E}_{A}<{E}_{B}<{E}_{C}.$ If  are the wavelengths of the radiation corresponding to the transitions C to B, B to A and C to A respectively, which of the following relation is correct?

1. ${\lambda }_{3}={\lambda }_{1}+{\lambda }_{2}$

2. ${\lambda }_{3}=\frac{{\lambda }_{1}{\lambda }_{2}}{{\lambda }_{1}+{\lambda }_{2}}$

3. ${\lambda }_{1}+{\lambda }_{2}+{\lambda }_{3}=0$

4. ${\lambda }_{3}^{2}={\lambda }_{1}^{2}+{\lambda }_{2}^{2}$

Subtopic:  Spectral Series |
77%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

In the Rutherford scattering experiment, what will be the correct angle for $\propto$-scattering for an impact parameter, b = 0?

1. ${90}^{\circ }$

2. ${270}^{\circ }$

3. ${0}^{\circ }$

4. ${180}^{\circ }$

Subtopic:  Various Atomic Models |
68%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

The velocity of the electron in the ground state (H - atom) is

1.

2.

3.

4.

Subtopic:  Various Atomic Models |
75%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The element which has K$\alpha$ X-ray line whose wavelength is 0.18 nm is:

1. Cobalt

2.  Xenon

3. Copper

4. Iron

Subtopic:  Spectral Series |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Calculate the highest frequency of the emitted photon in the Paschen series of spectral lines of the Hydrogen atom:

1.

2.

3.

4.

Subtopic:  Spectral Series |
58%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The energy of $$24.6$$ eV is required to remove one of the electrons from a neutral helium atom. What is the energy (in eV) required to remove both the electrons from a neutral helium atom?
1. $$38.2$$
2. $$49.2$$
3. $$51.8$$
4. $$79.0$$

Subtopic:  Bohr's Model of Atom |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Which of the following transitions gives photon of maximum energy?

1. n = 1 to n = 2

2. n = 2 to n = 1

3. n = 2 to n = 6

4. n = 6 to n = 2

Subtopic:  Bohr's Model of Atom |
62%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Hydrogen atoms are excited from ground state of the principal quantum number 4. Then, the number of spectral lines observed will be

1. 3

2. 6

3. 5

4. 2

Subtopic:  Spectral Series |
82%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints