Which of the transitions in hydrogen atom emits a photon of lowest frequency (n = quantum number)
(1) n = 2 to n = 1             

(2) n = 4 to n = 3

(3) n = 3 to n = 1             

(4) n = 4 to n = 2

Subtopic:  Spectral Series |
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According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
(a)+e28πε0r and  -e24πε0r            (b) +8πε0e2r and -4πε0e2r
(c) -e28πε0r and -e24πε0r            (d) +e28πε0r and +e24πε0r

Subtopic:  Bohr's Model of Atom |
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The absorption transitions between the first and the fourth energy states of hydrogen atom are 3. The emission transitions between these states will be 
1. 3             

2. 4

3. 5             

4. 6

Subtopic:  Spectral Series |
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The ratio of longest wavelength and the shortest wavelength observed in the five spectral series of emission spectrum of hydrogen is 
(1) 43             

(2) 525376

(3) 25

(4) 90011

Subtopic:  Spectral Series |
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In Bohr's model of hydrogen atom, let PE represents potential energy and TE the total energy. In going to a higher level 

(1) PE decreases, TE increases

(2) PE increases, TE increases

(3) PE decreases, TE decreases

(4) PE increases, TE decreases

Subtopic:  Bohr's Model of Atom |
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 According to Bohr's model, the radius of the second orbit of helium atom is 
(1) 0.53 Å             

(2) 1.06 Å

(3) 2.12 Å             

(4) 0.265 Å

Subtopic:  Bohr's Model of Atom |
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The fact that photons carry energy was established by

(1) Doppler's effect               

(2) Compton's effect

(3) Bohr's theory                   

(4) Diffraction of light

Subtopic:  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 
(1) He+        

(2) Li++

(3) Ne9+       

(4) Na10+

Subtopic:  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 
(1) 3.4 eV               

(2) 13.6 eV

(3) 54.4 eV             

(4) 122.4 eV

Subtopic:  Spectral Series |
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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 
(1) Red                   

(2) Yellow

(3) Green               

(4) Violet

Subtopic:  Spectral Series |
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