In case of hydrogen atom, which of the following transitions has released the maximum energy of radiation? 
1. \(n_2 = 2 ~~to~~ n_1 = 1 \)
2. \(n_2 = \infty ~~to~~ n_1 = 2\)
3. \(n_2 = 7 ~~to~~ n_1 = 3 \)
4. \(n_2 = \infty ~~to~~ n_1 = 3\)
Subtopic:  Hydrogen Spectra |
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The wavelength of the radiation emitted when in a H atom, the electron falls from infinity to stationary state (n=1), is:

1. 15 nm

2. 192 nm

3. 406 nm

4. 91 nm

Subtopic:  Hydrogen Spectra |
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The energy and the radius of the first orbit of He+ are respectively-

1. \(-8.72\times 10^{-18}J\); 0.02645 nm

2. \(8.72\times 10^{-18}J\); 0.02645 nm

3. \(-7.82\times 10^{-18}J\) ; 0.03655 nm

4. \(7.82\times 10^{-18}J\); 0.03655 nm

Subtopic:  Hydrogen Spectra |
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