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Q. No.According to Bohr's theory, what is the angular momentum of an electron located in the fifth orbit?
1.
2.
3.
4.
Subtopic: Bohr's Theory |
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Level 1: 80%+
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The radius of the second Bohr orbit for hydrogen atom is:
(Planck's Const. h = 6.6262 × 10–34 Js; mass of electron = 9.1091 × 10–31 kg; charge of electron e = 1.60210 ×10–19 C; permittivity of vaccum ∈0 = 8.854185 ×10–12 kg–1m–3A2)
1. 0.529 Å
2. 2.12 Å
3. 1.65 Å
4. 7.76 Å
Subtopic: Bohr's Theory |
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Given below are two statements:
In the light of the above statements, choose the correct answer from the option given below:
1. Both Statement I and Statement II are true.
2. Both Statement I and Statement II are false.
3. Statement I is true but Statement II is false.
4. Statement I is false but Statement II is true.
| Statement I: |  h\(\)v = (E2-E1) absorbs a photon. |
| Statement II: |  hv = (E2-E1) = emitted a photon. |
1. Both Statement I and Statement II are true.
2. Both Statement I and Statement II are false.
3. Statement I is true but Statement II is false.
4. Statement I is false but Statement II is true.
Subtopic: Bohr's Theory | Hydrogen Spectra |
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The speed of an electron in the 7th orbit is 3.6 x 106 m/s, the speed in 3rd orbit is-
1. 3.6 x 106 m/s
2. 8.4 x 106 m/s
3. 7.5 x 106 m/s
4. 1.8 x 106 m/s
1. 3.6 x 106 m/s
2. 8.4 x 106 m/s
3. 7.5 x 106 m/s
4. 1.8 x 106 m/s
Subtopic: Bohr's Theory |
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Level 1: 80%+
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According to Bohr's atomic theory:
| (A) | Kinetic energy of the electron is \(\mathrm{\propto {Z^2\over n^2}}\) |
| (B) | The product of velocity (v) of electron and principal quantum number \(\mathrm{(n), 'vn'\propto Z^2}.\) |
| (C) | Frequency of revolution of the electron in an orbit is \(\mathrm{\propto {Z^3\over n^3}}.\) |
| (D) |
Coulombic force of attraction on the electron is \(\propto \dfrac{\mathrm{z}^3}{\mathrm{n}^4}.\) |
Choose the most appropriate answer from the options given below :
1. (C) Only
2. (A) Only
3. (A), (C) and (D) only
4. (A) and (D) only
Subtopic: Bohr's Theory |
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The angular momentum of an electron in an orbit of radius \(\mathrm{R}\) in a hydrogen atom is directly proportional to ____.
| 1. | \(\mathrm{R}\) | 2. | \(\dfrac{1}{R}\) |
| 3. | \(\dfrac{1}{\sqrt{R}}\) | 4. | \(\sqrt{R}\) |
Subtopic: Bohr's Theory |
Level 3: 35%-60%
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