Energy levels A, B, C of a certain atom correspond to increasing values of energy i.e. EA<EB<EC. If λ1, λ2, λ3 are the wavelengths of the radiation corresponding to the transitions C to B, B to A and C to A respectively, which of the following relation is correct?

1. λ3=λ1+λ2 

2. λ3=λ1λ2λ1+λ2

3. λ1+λ2+λ3=0 

4. λ32=λ12+λ22

Subtopic:  Spectral Series |
 77%
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In the Rutherford scattering experiment, what will be the correct angle for -scattering for an impact parameter, b = 0?

1. 90

2. 270

3. 0 

4. 180

Subtopic:  Various Atomic Models |
 68%
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The velocity of the electron in the ground state (H - atom) is 

1. 2.18×105 m/s   

2. 2.18×106 m/s

3. 2.18×107 m/s   

4. 2.18×108 m/s

Subtopic:  Various Atomic Models |
 75%
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The element which has Kα X-ray line whose wavelength is 0.18 nm is:

1. Cobalt 

2.  Xenon

3. Copper 

4. Iron

Subtopic:  Spectral Series |
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Calculate the highest frequency of the emitted photon in the Paschen series of spectral lines of the Hydrogen atom:

1. 3.7×1014 Hz 

2. 9.1×1015 Hz

3. 10.23×1014 Hz

4. 29.7×1015 Hz

Subtopic:  Spectral Series |
 58%
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The energy of \(24.6\) eV is required to remove one of the electrons from a neutral helium atom. What is the energy (in eV) required to remove both the electrons from a neutral helium atom?
1. \(38.2\)
2. \(49.2\)
3. \(51.8\)
4. \(79.0\)

Subtopic:  Bohr's Model of Atom |
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Which of the following transitions gives photon of maximum energy?

1. n = 1 to n = 2 

2. n = 2 to n = 1

3. n = 2 to n = 6 

4. n = 6 to n = 2

Subtopic:  Bohr's Model of Atom |
 62%
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Hydrogen atoms are excited from ground state of the principal quantum number 4. Then, the number of spectral lines observed will be

1. 3   

2. 6

3. 5

4. 2

Subtopic:  Spectral Series |
 82%
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When electron jumps from n = 4 to n = 2 orbit, we get [2000]

1. second line of Lyman series

2. second line of Balmer series

3. second line of Paschen series

4. an absorption line of Balmer series

Subtopic:  Spectral Series |
 83%
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The spectrum obtained from a sodium vapour lamp is an example of

1. band spectrum

2.  continuous spectrum

3. emission spectrum

4. absorption spectrum

Subtopic:  Spectral Series |
 62%
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