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Q. No.The correct relation between the radius of 3rd and 4th Bohr orbit for H-atom is:
1. \(\frac{r_3}{r_4}=\frac{16}{9} \)
2. \(\frac{r_3}{r_4}=\frac{9}{16} \)
3. \(\frac{r_3}{r_4}=\frac{9}{4} \)
4. \(\frac{r_3}{r_4}=\frac{3}{16} \)
1. \(\frac{r_3}{r_4}=\frac{16}{9} \)
2. \(\frac{r_3}{r_4}=\frac{9}{16} \)
3. \(\frac{r_3}{r_4}=\frac{9}{4} \)
4. \(\frac{r_3}{r_4}=\frac{3}{16} \)
Subtopic: Hydrogen Spectra |
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Level 1: 80%+
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Calculate the velocity of the electron in the first orbit of H-atom.
(me= \(9.1\times10^{-31}\text{kg}\))
1. \(2.18 \times 10^5 \mathrm{~m} / \mathrm{s}\)
2. \(2.18 \times 10^6 \mathrm{~m} / \mathrm{s}\)
3. \(2.18 \times 10^7 \mathrm{~m} / \mathrm{s}\)
4. \(2.18 \times 10^4 \mathrm{~m} / \mathrm{s}\)
(me= \(9.1\times10^{-31}\text{kg}\))
1. \(2.18 \times 10^5 \mathrm{~m} / \mathrm{s}\)
2. \(2.18 \times 10^6 \mathrm{~m} / \mathrm{s}\)
3. \(2.18 \times 10^7 \mathrm{~m} / \mathrm{s}\)
4. \(2.18 \times 10^4 \mathrm{~m} / \mathrm{s}\)
Subtopic: Hydrogen Spectra |
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Level 1: 80%+
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Subtopic: Hydrogen Spectra |
87%
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Match the following:
1. A → (iv), B → (iii) C → (i), D → (ii)
2. A → (i), B → (iii) C → (ii), D → (iv)
3. A → (iv), B → (ii) C → (iii), D → (iv)
4. A → (i), B → (ii) C → (iii), D → (iv)
| (A) | Lyman | (i) | IR |
| (B) | Balmer | (ii) | IR |
| (C) | Paschen | (iii) | Visible |
| (D) | Pfund | (iv) | UV |
1. A → (iv), B → (iii) C → (i), D → (ii)
2. A → (i), B → (iii) C → (ii), D → (iv)
3. A → (iv), B → (ii) C → (iii), D → (iv)
4. A → (i), B → (ii) C → (iii), D → (iv)
Subtopic: Hydrogen Spectra |
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The wave number of the first emission line in the Balmer series of H-Spectrum is:
(R = Rydberg constant)
(R = Rydberg constant)
| 1. | \(\frac{5}{36} R\) | 2. | \(\frac{9}{400} R\) |
| 3. | \(\frac{7}{6} R\) | 4. | \(\frac{3}{4} R\) |
Subtopic: Hydrogen Spectra |
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Which of the following series of transitions in the spectrum of hydrogen atoms falls in the visible region?
1. Brackett series
2. Lyman series
3. Balmer series
4. Paschen series
Subtopic: Hydrogen Spectra |
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Level 1: 80%+
NEET - 2019
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The radius of the second orbit of the \(\text{Li}^{2+}\) ion is x. What will be the radius of the third orbit of the \(\text{Be}^{3+}\) ion?
| 1. | \(\dfrac{27 x}{16}\) | 2. | \(\dfrac{16 x}{27}\) |
| 3. | \(\dfrac{4 x}{3}\) | 4. | \(\dfrac{3 x}{4}\) |
Subtopic: Hydrogen Spectra |
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Level 1: 80%+
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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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In which shell of hydrogen atom, velocity of electron is the highest?
| 1. | 1st shell | 2. | 2nd shell |
| 3. | 3rd shell | 4. | 4th shell |
Subtopic: Bohr's Theory | Hydrogen Spectra |
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