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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: Â Spectral Series |
Â 74%
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NEET - 2017
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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: Â Bohr's Model of Atom |
Â 78%
From NCERT
NEET - 2018
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Given that the value of the Rydberg constant is $$10^{7}~\text{m}^{-1}$$, what will be the wave number of the last line of the Balmer series in the hydrogen spectrum?
1. $$0.5 \times 10^{7}~\text{m}^{-1}$$
2. $$0.25 \times 10^{7} ~\text{m}^{-1}$$
3. $$2.5 \times 10^{7}~\text{m}^{-1}$$
4. $$0.025 \times 10^{4} ~\text{m}^{-1}$$

Subtopic: Â Spectral Series |
Â 85%
From NCERT
NEET - 2016
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When an $$\alpha\text-$$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. $$\frac{1}{\sqrt{m}}$$
2. $$\frac{1}{m^{2}}$$
3. $$m$$
4. $$\frac{1}{m}$$

Subtopic: Â Various Atomic Models |
Â 73%
From NCERT
NEET - 2016
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If an electron in a hydrogen atom jumps from the $$3^{\text{rd}}$$ orbit to the $$2^{\text{nd}}$$ orbit, it emits a photon of wavelength $$\lambda$$. When it jumps from the $$4^{\text{th}}$$ orbit to the $$3^{\text{rd}}$$ orbit, the corresponding wavelength of the photon will be:
1. $$\frac{16}{25}\lambda$$
2. $$\frac{9}{16}\lambda$$
3. $$\frac{20}{7}\lambda$$
4. $$\frac{20}{13}\lambda$$

Subtopic: Â Bohr's Model of Atom |
Â 78%
From NCERT
NEET - 2016
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