In the Bohr model of H-atom, an electron (e) is revolving around a proton (p) with velocity v. If r is the radius of the orbit, m is the mass and ε0 is vacuum permittivity, then the value of v is:

1.  e4πmε0r

2. 2eπmε0r

3. eπmε0r

4. e4πmε0r

Subtopic:  Bohr's Model of Atom |
 71%
From NCERT
AIPMT - 1998
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Maximum frequency of emission is obtained for the transition:

1. n = 2 to n = 1

2. n = 6 to n = 2

3. n = 1 to n = 2

4. n = 2 to n = 6

Subtopic:  Bohr's Model of Atom |
 57%
From NCERT
AIPMT - 2000
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The life span of atomic hydrogen is:

1. Fraction of one sec

2. One year

3. One hour

4. One day

Subtopic:  Bohr's Model of Atom |
 80%
From NCERT
AIPMT - 2000
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

When an electron transitions from n = 4 to n = 2, then the emitted line in the spectrum will be:

1. the first line of the Lyman series.
2. the second line of the Balmer series.
3. the first line of the Paschen series.
4. the second line of the Paschen series.

Subtopic:  Spectral Series |
 86%
From NCERT
AIPMT - 2000
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If the energy of the hydrogen atom in nth orbit is En, then the energy in nth orbit of the singly ionised helium atom will be:
1.  4En
2.  En/4
3.  2En
4.  En/2

Subtopic:  Bohr's Model of Atom |
 73%
From NCERT
AIPMT - 2001
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius r. What is the coulomb force F between the two? \(\left ( \text{where},K=\frac{1}{4\pi \epsilon _{0}} \right )\)

1. Ke2r2r^

2. -Ke2r3r^

3. Ke2r3r

4. -Ke2r3r

Subtopic:  Various Atomic Models |
 53%
From NCERT
AIPMT - 2003
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

In which of the following systems will the radius of the first orbit (n = 1) be minimum:

1. doubly ionized lithium

2. singly ionized helium

3. deuterium atom

4. hydrogen atom

Subtopic:  Bohr's Model of Atom |
 70%
From NCERT
AIPMT - 2003
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Energy \(\mathrm{E}\) of a hydrogen atom with principal quantum number \(n\) is given by \(E=-\frac{13.6}{n^{2}}~eV.\) The energy of a photon ejected when the electron jumps from \(n=3\) state to \(n=2\) state of hydrogen is approximately:
1. \(0.85~\mathrm{eV}\)
2. \(3.4~\mathrm{eV}\)
3. \(1.9~\mathrm{eV}\)
4. \(1.5~\mathrm{eV}\)

Subtopic:  Bohr's Model of Atom |
 76%
From NCERT
AIPMT - 2004
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The Bohr model of atoms:
 

1. uses Einstein's photoelectric equation
2. predicts continuous emission spectra for atoms
3. predicts the same emission spectra for all types
of atoms
4. assumes that the angular momentum of electrons is
quantized
Subtopic:  Bohr's Model of Atom |
 80%
From NCERT
AIPMT - 2004
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The total energy of an electron in the first excited state of a hydrogen atom is about –3.4 eV. Its kinetic energy in this state will be:

1. –6.8 eV

2. 3.4 eV

3. 6.8 eV

4. –3.4 eV

Subtopic:  Bohr's Model of Atom |
 83%
From NCERT
AIPMT - 2005
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh