The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is:

1. 1 : 1

2. 1 : -1

3. 2 : -1

4. 1 : -2

Subtopic:  Bohr's Model of Atom |
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The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is: 

(1) 2

(2) 1

(3) 4

(4) 0.05

Subtopic:  Spectral Series |
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The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is:-

1. 1

2. 4

3. 0.5

4. 2

Subtopic:  Spectral Series |
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Electrons of mass m with de- Broglie wavelength λ fall on the target in an X-ray tube. The cut-off wavelength (λo) of the emitted X-ray is :

1.  λ0=2mcλ2h

2.  λ0=2hmc

3.  λ0=2m2c2λ2h2

4.  λ0=λ

Subtopic:  X-Ray |
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If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength λ. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be

1.  1625λ

2.  916λ

3.  207λ

4.  2013λ

Subtopic:  Bohr's Model of Atom |
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Given that the value of the Rydberg constant is 107 m-1, what will be the wave number of the last line of the Balmer series in the hydrogen spectrum?
1. \(0.5 \times 10^{7} ~m^{-1}\)
2. \(0.25 \times 10^{7} \mathrm{~m}^{-1}\)
3. \(2.5 \times 10^{7} \mathrm{~m}^{-1}\)
4. \(0.025 \times 10^{4} ~m^{-1}\)

Subtopic:  Spectral Series |
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When an α– particle of mass m moving with velocity v bombards on a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on m as:
1. 1m
2. 1m2
3. m
4. 1m
Subtopic:  Various Atomic Models |
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NEET MCQ Books for 11th Physics, Chemistry & Biology