Assertion: The positively charged nucleus of an atom has a radius of almost 10-15 m.
Reason: In $$\alpha$$-particle scattering experiment, the distance of the closest approach for $$\alpha$$-particle is ≈10-15 m.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.

Subtopic:  Various Atomic Models |
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Given below are two statements:
 Assertion (A): The phenomenon of X-ray production is basically inverse of photoelectric effect. Reason (R): X-rays are electromagnetic waves.

 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:  X-Ray |
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Assertion: The hydrogen atom consists of only one electron but its emission spectrum has many lines.
Reason: Only Lyman series is found in the absorption spectrum of hydrogen atoms whereas in the emission spectrum, all the series are found.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.

Subtopic:  Spectral Series |
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Assertion: Balmer series lies in the visible region of the electromagnetic spectrum.
Reason: $$\frac{1}{\lambda}=\mathrm{R}\left[\frac{1}{2^{2}}-\frac{1}{n^{2}}\right], \text { where } n=3,4,5$$
1. Both the assertion and reason are true and reason explains the assertion.
2. Both the assertion and reason are true but reason does not explain the assertion.
3. Assertion is true but reason is false.
4. Assertion is false but reason is true.

Subtopic:  Spectral Series |
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Assertion: Rydberg's constant does not vary with the mass number of a given element.
Reason: The reduced mass of the electron is dependent on the mass of the nucleus only.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Subtopic:  Bohr's Model of Atom |
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Assertion: LASER is used to measure distant objects as moon.
Reason: They are highly coherent sources of light.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Subtopic:  Spectral Series |
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Assertion: Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate.
Reason: According to classical physics all accelerating electrons radiate.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Subtopic:  Bohr's Model of Atom |
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Assertion: In He-Ne laser, population inversion takes place between energy levels of neon atoms.
Reason: Helium atoms have a meta-stable energy level.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Subtopic:  Spectral Series |
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Assertion: A hydrogen atom at the ground state cannot absorb a photon of energy 10 eV.
Reason: First excitation energy of the hydrogen atom is 10.2 eV. The hydrogen atom absorbs only those photons which provide it the excitation energy.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Subtopic:  Bohr's Model of Atom |
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Assertion: Magnetic moment associated with an electron in hydrogen atom is quantized.
Reason: Magnetic moment associated with the electron is an integral multiple of Bohr's magneton but is independent of atomic number.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Subtopic:  Bohr's Model of Atom |
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