Hydrogen ( H 1 1 ) Deuterium ( H 1 2 ) , singly ionised Helium ( H 2 e 4 ) + and double ionised lithium ( L 3 i 6 ) + + all have one electron around the nucleus. Consider an electron transition from n = 2 to n = 1 . If the wave lengths of emitted radiation are λ 1 , λ 2 , λ 3 , λ 4 respectively then approximately which one of the following is correct?

λ 1 = 2 λ 2 = 3 λ 3 = 4 λ 4

4 λ 1 = 2 λ 2 = 2 λ 3 = λ 4

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As per Bohr model, the minimum energy (in $e V$ ) required to remove an electron from the ground state of $L i^{+ +}$ (doubly-ionised $L i$ atom) is:

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Important Questions on Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 10

If elements with principal quantum number

n > 4

did not exist in nature, the number of possible elements would be:

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 11

The transition from

n = 4

n = 3

in a hydrogen like atom result in ultravoilet radiation. Infrared radiation will be obtained in the transition from:

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 12

Hydrogen

({{}_{1}H}^{1})

Deuterium

({{}_{1}H}^{2})

, singly ionised Helium

{({{}_{2}H e}^{4})}^{+}

and double ionised lithium

({}_{3}L i {^{6})}^{+ +}

all have one electron around the nucleus. Consider an electron transition from

n = 2

n = 1

. If the wave lengths of emitted radiation are

λ_{1}, λ_{2}, λ_{3}, λ_{4}

respectively then approximately which one of the following is correct?

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 13

Hydrogen atom in ground state is excited by a monochromatic radiation of

λ = 975 \overset{0}{A}

. The number of spectral lines in the resulting spectrum emitted will be

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 14

Energy required for the electron excitation in

{Li}^{+ +}

from the first to the third Bohr orbit is?

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 15

Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths $r = \frac{λ_{1}}{λ_{2}}$ is given by :

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 16

The radiation corresponding to

3 \to 2

transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of

3 \times 10^{- 4} T

. If the radius of the largest circular path followed by these electrons is 10.0mm, the work function of the metal is close to

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 17

The ratio of wavelength of the last line of Balmer series and the last line Lyman series is:

As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of Li++ (doubly-ionised Li atom) is:

Important Questions on Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom

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As per Bohr model, the minimum energy (in $e V$ ) required to remove an electron from the ground state of $L i^{+ +}$ (doubly-ionised $L i$ atom) is: