The longest and shortest wavelength of the Lyman series are (respectively)

1.  1215 A0, 500 A0   

2.  1215 A0, 912 A0  

3.  912 A0, 500 A0   

4.  912 A0, 700 A0

Subtopic:  Spectral Series |
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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

Subtopic:  Bohr's Model of Atom |
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When the electron of a hydrogen-like atom jumps from a higher energy level to a lower energy level, then,

1.  the 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.  the potential energy increases.

Subtopic:  Bohr's Model of Atom |
 65%
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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

 

Subtopic:  Bohr's Model of Atom |
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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

Subtopic:  Bohr's Model of Atom |
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A X-ray tube operates at an accelerating potential of 20 kV. Which of the following wavelength will be absent in the continuous spectrum of X-rays?

1.  12 pm

2.  75 pm

3.  65 pm

4.  95 pm

Subtopic:  X-Ray (OLD NCERT) |
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which of the following is positively charged?

1.  α-particles  

2.  β-particles  

3.  γ-rays  

4.  X-rays

Subtopic:  X-Ray (OLD NCERT) |
 85%
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The wavelength of Kα X-rays for lead isotopes Pb208, Pb206, Pb204 are λ1, λ2 and λ3 respectively. Then

1. λ1=λ2>λ3   

2. λ1>λ2>λ3

3. λ1<λ2<λ3 

4. λ2=λ1=λ3

Subtopic:  X-Ray (OLD NCERT) |
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The graph between the square root of the frequency of a specific line of the characteristic spectrum of X-rays and the atomic number of the target will be:

1.

2. 

3. 

4. 

Subtopic:  X-Ray (OLD NCERT) |
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The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of V volt is equal to 

1. eVhc 

2. ehcV 

3. hceV 

4. cVeh

Subtopic:  X-Ray (OLD NCERT) |
 83%
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