Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 
Assertion (A): Rydberg's constant does not vary with the mass number of a given element.
Reason (R): The reduced mass of the electron is dependent on the mass of the nucleus only.

In the light of the above statements choose the correct answer from the options given below:
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
 
 
Subtopic:  Bohr's Model of Atom |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
Assertion (A): Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate.
Reason (R): According to classical physics all accelerating electrons radiate.
In the light of the above statements choose the correct answer from the options given below:
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Bohr's Model of Atom |
 54%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 
Assertion (A): A hydrogen atom at the ground state cannot absorb a photon of energy 10 eV.
Reason (R): First excitation energy of the hydrogen atom is 10.2 eV. The hydrogen atom absorbs only those photons which provide it the excitation energy.

In the light of the above statements choose the correct answer from the options given below:
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Bohr's Model of Atom |
 77%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 
Assertion (A): Magnetic moment associated with an electron in hydrogen atom is quantized.
Reason (R): Magnetic moment associated with the electron is an integral multiple of Bohr's magneton but is independent of atomic number.

In the light of the above statements choose the correct answer from the options given below:
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Bohr's Model of Atom |
 74%
From NCERT
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The Bohr model for the spectra of a \(H\)-atom:

a. will not apply to hydrogen in the molecular form.
b. will not be applicable as it is for a He-atom.
c. is valid only at room temperature.
d. predicts continuous as well as discrete spectral lines.

1. (a), (b)
2. (c), (d)
3. (b), (c)
4. (a), (d)

Subtopic:  Bohr's Model of Atom |
 57%
From NCERT
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Let En=-18ε02me4n2h2 be the energy of the nth level of H-atom. If all the H-atoms are in the ground state and radiation of frequency (E2-E1)h falls on it,

(a) it will not be absorbed at all
(b) some of the atoms will move to the first excited state
(c) all atoms will be excited to the n = 2 state
(d) no atoms will make a transition to the n = 3 state

1. (b, d)

2. (a, d)

3. (b, c, d)

4. (c, d)

Subtopic:  Bohr's Model of Atom |
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The simple Bohr model is not applicable to He4 atom because

(a) He4 is an inert gas
(b) He4 has neutrons in the nucleus
(c) He4 has one more electron
(d) electrons are not subject to central forces

1. (a, c)

2. (a, c, d)

3. (b, d)

4. (c, d)

Subtopic:  Bohr's Model of Atom |
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Select the correct option based on the statements given below:
Assertion (A): The magnetic moment of a hydrogen-like atom is higher when it is in a state of higher quantum number \(n.\)
Reason (R): The magnetic moment of hydrogen-like atom, as calculated from Bohr's theory, is directly proportional to the principal quantum number \(n.\)
 
1. (A) is True but (R) is False.
2. (A) is False but (R) is True.
3. Both (A) and (R) are True and (R) is the correct explanation of (A).
4. Both (A) and (R) are True but (R) is not the correct explanation of (A).
Subtopic:  Bohr's Model of Atom |
 76%
From NCERT
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The energy of an atom with a K-shell vacancy is EK, that with an L-shell vacancy is EL, and that with an M- shell vacancy is EM: all compared to an atom with no vacancy, then, 
(I) EK < E
(II) EL > EM 
(III) EL - EK \(E_{K\alpha}\), the energy of \(K_\alpha \) photon
1. I is true 
2. I, III are true 
3. II is true 
4. I, II are true 
 
Subtopic:  Bohr's Model of Atom |
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Given below are two statements: 
Statement I: The time period of revolution of an electron in its \(n^\text{th}\) Bohr orbit in an atom is directly proportional to \(n^3.\)
Statement II: The K.E. of an electron in its \(n^\text{th}\) Bohr orbit in an atom is directly proportional to \(n.\)
 
1. Statement I is incorrect and Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct and Statement II is incorrect.
Subtopic:  Bohr's Model of Atom |
 79%
From NCERT
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