If R is the Rydberg’s constant for hydrogen the wave number of the first line in the Lyman series will be

(1) R4                   

(2) 3R4
(3) R2                 

(4) 2R

Subtopic:  Spectral Series |
 88%
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In hydrogen atom, if the difference in the energy of the electron in n =2 and n = 3 orbits is E, the ionization energy of hydrogen atom is 

(1) 13.2 E               

(2) 7.2 E

(3) 5.6 E                 

(4) 3.2 E

Subtopic:  Bohr's Model of Atom |
 65%
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The first member of the Paschen series in hydrogen spectrum is of wavelength 18,800 Å. The short wavelengths limit of Paschen series is 

(1) 1215 Å     

(2) 6560 Å

(3) 8225 Å     

(4) 12850 Å

Subtopic:  Spectral Series |
 70%
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What is the ratio of the largest to shortest wavelengths in the Lyman series of hydrogen spectra?

1. 259        

2. 176
3. 95           

4. 43

Subtopic:  Spectral Series |
 83%
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In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n =2 and n = 1 orbits is

(1) 2 : 1             

(2) 4 : 1

(3) 8 : 1             

(4) 16 : 1

Subtopic:  Bohr's Model of Atom |
 80%
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What is the ratio of the longest to shortest wavelengths in Brackett series of hydrogen spectra?
1. 259           

2. 176

3. 95             

4. 43

Subtopic:  Spectral Series |
 80%
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The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true 

1. Its kinetic energy increases and its potential and total energies decrease
2. Its kinetic energy decreases, potential energy increases and its total energy remains the same
3. Its kinetic and total energies decrease and its potential energy increases
4. Its kinetic, potential and total energies decreases
Subtopic:  Spectral Series |
 73%
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The ratio of minimum to maximum wavelength in Balmer series is 

(1) 5 : 9           

(2) 5 : 36

(3) 1 : 4           

(4) 3 : 4

Subtopic:  Spectral Series |
 78%
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Rutherford’s α-particle experiment showed that the atoms have

(1) Proton         

(2) Nucleus

(3) Neutron     

(4) Electrons

Subtopic:  Various Atomic Models |
 85%
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Which of the following is true for number of spectral lines in going from Lyman series to Pfund series ?

(1) Increases

(2) Decreases

(3) Unchanged

(4) May decreases or increases

Subtopic:  Spectral Series |
 55%
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