According to Bohr's model, the radius of the second orbit of helium atom is 
(a) 0.53 Å             (b) 1.06 Å
(c) 2.12 Å             (d) 0.265 Å

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Bohr's model of atom
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The fact that photons carry energy was established by

(a) Doppler's effect               (b) Compton's effect
(c) Bohr's theory                   (d) Diffraction of light

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Bohr's model of atom
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An ionic atom equivalent to hydrogen atom has wavelength equal to 1/4 of the wavelengths of hydrogen lines. The ion will be 
(a) He+         (b) Li++
(c) Ne9+        (d) Na10+

Concept Questions :-

Spectral series
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The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be 
(a) 3.4 eV                (b) 13.6 eV
(c) 54.4 eV              (d) 122.4 eV

Concept Questions :-

Spectral series
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An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV energy is required to ionize it is 
(a) 13.6 eV                    (b) 6.53 eV
(c) 5.4 eV                      (d) 1.51 eV

Concept Questions :-

Various atomic model
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Hydrogen atom emits blue light when it changes from n = 4 energy level to the n = 2 level. Which colour of light would the atom emit when it changes from the n = 5 level to the n = 2 level 
(a) Red                   (b) Yellow
(c) Green                (d) Violet

Concept Questions :-

Spectral series
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The first line of Balmer series has wavelength 6563 Å. What will be the wavelength of the first member of Lyman series

(a) 1215.4 Å             (b) 2500 Å
(c) 7500 Å                (d) 600 Å

Concept Questions :-

Spectral series
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In Bohr's model, the atomic radius of the first orbit is r0, then the radius of the third orbit is
(a) r09               (b) r0
(c) 9r0               (d) 3r0

Concept Questions :-

Bohr's model of atom
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The wavelength of the energy emitted when electron come from fourth orbit to second orbit in hydrogen is 20.397 cm. The wavelength of energy for the same transition in He+ is

(a) 5.099 cm-1             (b) 20.497 cm-1
(c) 40.994 cm-1            (d) 81.988 cm-1

Concept Questions :-

Bohr's model of atom
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Minimum excitation potential of Bohr's first orbit in hydrogen atom is
(a) 13.6 V                     (b) 3.4 V
(c) 10.2 V                     (d) 3.6 V

Concept Questions :-

Bohr's model of atom
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