- 1(current)
Q. No.Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
| Statement I: | The Balmer spectral line for H atom with lowest energy appears at \(\dfrac 5{36}\mathrm{ R_H~ cm^{-1}}\) (\(\mathrm{R_H}\) = Rydberg constant) |
| Statement II: | When the temperature of a black body increases, the maxima of the curve (intensity versus wavelength) shifts towards shorter wavelength. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Bohr's Theory | Planck's Theory |
67%
Level 2: 60%+
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The change in orbit angular momentum corresponding to an electron transition from excited state to the ground state of a hydrogen atom can be given by:
| 1. | \(\dfrac{h}{\pi}\) | 2. | \(\dfrac{3 h}{2 \pi}\) |
| 3. | \(\dfrac{h}{2 \pi}\) | 4. | \(\dfrac{2 h}{\pi}\) |
Subtopic: Bohr's Theory |
68%
Level 2: 60%+
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Given below are two statement:
| Statement I: | The energy of the \(\mathrm{He}^{+}\) ion in \(n=2\) state is same as the energy of H atom in \(n=1\) state |
| Statement II: | It is possible to determine simultaneously the exact position and exact momentum of an electron in \(\mathrm{H}\) atom. |
| 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 Theory | Heisenberg Uncertainty Principle |
Level 4: Below 35%
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| Assertion (A): | The radius of the second orbit of He+ is equal to that of the first orbit of hydrogen. |
| Reason (R): | The radius of an orbit in hydrogen-like species is directly proportional to n and inversely proportional to Z. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of the (A). |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of the (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Bohr's Theory |
73%
Level 2: 60%+
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The radius of 2nd orbit of \(\mathrm{He}^{\oplus}\) is \(r_0 \). The radius of 4th orbit of \(Be^{+3} \) is \(\text {xr}_0 \). The value of x is:
1. 4
2. 2
3. 6
4. 8
1. 4
2. 2
3. 6
4. 8
Subtopic: Bohr's Theory |
81%
Level 1: 80%+
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The energy of electron in the ground state \((\text{n}=1)\) for \(\text{He}^+\) ion is \(\text{-x}J,\) then that for an electron in \(\text{n}=2\) state for \(\text{Be}^{3+}\) ion in \(\text{J}\) is :
| 1. | \(-\dfrac x9\) | 2. | \(-4x\) |
| 3. | \(-\dfrac 49x\) | 4. | \(-x\) |
Subtopic: Bohr's Theory |
65%
Level 2: 60%+
NEET - 2024
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Given below are two statements:
| Assertion (A): | Splitting of spectral lines under the influence of an electric field is known as the Stark effect. |
| Reason (R): | Bohr’s theory accounts for this splitting of spectral lines. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Bohr's Theory |
69%
Level 2: 60%+
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If the diameter of a carbon atom is 0.15 nm, the number of carbon atoms that can be placed side by side in a straight line across the length of the scale of length 20 cm long will be:
| 1. | 1.33 × 107 | 2. | 5.46 × 108 |
| 3. | 1.33 × 109 | 4. | 2.36 × 108 |
Subtopic: Bohr's Theory |
71%
Level 2: 60%+
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The circumference of the Bohr orbit for the H atom is related to the de Broglie wavelength associated with the electron revolving around the orbit by the following relation:
1.
2.
3.
4.
Subtopic: Bohr's Theory | De Broglie Equation |
82%
Level 1: 80%+
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- 1(current)
Q. No.
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