When the electron of a hydrogen-like atom jumps from a higher energy level to a lower energy level, then

1.  Angular momentum of the electron remains constant

2.  The kinetic energy of the electron increases

3.  The wavelength of the de-Broglie wave associated with the motion of the electron increases

4.  Potential energy increases

 

Concept Questions :-

Bohr's model of atom
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The energy of a hydrogen atom in its ground state is —13.6 eV. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is:

1. -2.72 eV

2. - 0.85 eV

3. -0.54 eV

4. — 3.4 eV

 

Concept Questions :-

Bohr's model of atom
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When neutron moving with Kinetic Energy 2eV collides with 

stationary H11 in the ground state, the collision will be:

1.  Must be elastic

2.  may be inelastic

3.  Both

4.  Must be perfectly inelastic

 

Concept Questions :-

Various atomic model
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The potential difference applied to an X-ray tube is 5 kV and current through it is 3.2 mA. The number of electrons striking the target per sec is:

1.  2 × 1016   

2.  5 × 106   

3.  1 × 1017  

4.  4 × 1015

Concept Questions :-

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Magnetic moment due to the motion of the electron in nth  energy state of a hydrogen atom is proportional to

1.  n

2.  n0 

3.  n5  

4.  n3

Concept Questions :-

Bohr's model of atom
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The frequency Of radiation emitted during the transition of an electron from a second excited state to a first excited state in H-atom is f0. The frequency of the same transition emitted by a singly ionized He ion is

1.  2f0 

2.  4f0  

3.  f02  

4.  f04

Concept Questions :-

Bohr's model of atom
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Which of the following transition in a hydrogen atom will produce radiations of minimum wavelength?

1.  n = 2 to n = 1

2.  n = 5 to n = 3

3.  n = 10 to n = 5

4.  n = 10 to n = 3

Concept Questions :-

Spectral series
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The angular speed of electron in a hydrogen atom in nth orbit is proportional to -

1.  n3  

2.  n-3 

3.  n-2  

4.  n2

Concept Questions :-

Bohr's model of atom
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If λ1 be longest wavelength of Lyman series and λ2 be the longest wavelengthof Balmer series for a hydrogen atom. What is the wavelength of photon emittedwhen an electron makes a transition from n = 3 to n = 1 in a hydrogen atom?

1.  λ1 + λ2 

2.  1λ1 + 1λ2-1 

3.  λ1 + λ22 

4.  λ1λ2

 

Concept Questions :-

Spectral series
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The shortest wavelength of Balmer series is about 

1.  912Ao

2.  121Ao

3.  3648Ao

4.  4864Ao

 

Concept Questions :-

Spectral series
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