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 |
 69%
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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 |
 68%
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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 |
 77%
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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 |
 51%
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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 |
 64%
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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

(1) 1215.4 Å             

(2) 2500 Å

(3) 7500 Å               

(4) 600 Å

Subtopic:  Spectral Series |
 79%
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The wavelength of the energy emitted when electrons come from the fourth orbit to the second orbit in hydrogen is 20.397 cm. The wavelength of energy for the same transition in He+ is:

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

Subtopic:  Bohr's Model of Atom |
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Minimum excitation potential of Bohr's first orbit in hydrogen atom is
(1) 13.6 V                     

(2) 3.4 V

(3) 10.2 V                     

(4) 3.6 V

Subtopic:  Bohr's Model of Atom |
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Which of the following statements are true regarding Bohr's model of hydrogen atom?

(I) Orbiting speed of electron decreases as it shifts to discrete orbits away from the nucleus

(II) Radii of allowed orbits of electron are proportional to  principal quantum number

(III) Frequency with which electrons orbits around the nucleus in discrete orbits is inversely proportional to the cube of principal quantum number

(IV) Binding force with which the electron is bound to the nucleus increases as it shifts to outer orbits
Select correct answer using the codes given below
Codes :
(1) I and III                 

(2) II and IV

(3) I, II and III           

(4) II, III and IV

Subtopic:  Bohr's Model of Atom |
 60%
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 For electron moving in nth orbit of H-atom the angular velocity is proportional to 
(1) n                       

(2) 1/n

(3) n3                    

(4) 1/n3

Subtopic:  Bohr's Model of Atom |
 55%
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