For non-relativistic speeds, the wavelength associated with an electron and its kinetic energy E are related as:

1.  λ  E 

2.  λ  E-1  

3.  λ  E1/2 

4.  λ  E-1/2

 

Concept Questions :-

Davisson and Germer experiment
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An electron at rest is acceleration by a potential difference of 600V. The de-Broglie wavelength associated with the electron is:

1.  1Ao

2.  2Ao

3.  3Ao

4.  0.5 Ao

 

Concept Questions :-

Davisson and Germer experiment
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The de-Broglie wavelength of a body of mass 1 kg moving with a velocity of 2000 m/s is

1.  3.32 x 10-27 Ao  

2.  1.5 x 107 Ao  

3.  0.55 x 10-22 Ao 

4.  None of these

Concept Questions :-

De-broglie wavelength
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Light of wavelength 4000 Å falls on a photosensitive metal and a negative 2V potential stops the emitted electrons.

The work function of the material (in eV) is approximately 

h=6.6 x 10-34 Js, e=1.6 x 10-19 C, c=3 x 108 ms-1
1.  1.1

2.  2.0

3.  2.2

4.  3.1

Concept Questions :-

Photoelectric effect experiment
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The work functions for metal A, metal B, and metal C are ϕA,ϕB and ϕC respectively. Then-

                                 

1.   ϕA < ϕB < ϕC  

2.  ϕA = ϕB < ϕC  

3.  ϕA > ϕB > ϕC

4.  None of these

Concept Questions :-

Einstein photo-electric equation
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A particle of mass M at rest decays into two particles of 

masses m1 and m2 having non-zero velocities. 

The ratio of de-Broglie wavelength is: 

1.  m1m2 

2.  m2m1 

3.  1

4.  m2m1

 

Concept Questions :-

De-broglie wavelength
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If the momentum of a photon is p, then its energy is :

1.  pc

2.  12pc  

3.  p22c  

4.  14pc

 

Concept Questions :-

De-broglie wavelength
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When the light of wavelength λ = 3100 Ao is made to fall on metal in a photoelectric experiment, the maximum kinetic energy of emitted electrons is found to be 2.5eV. The work function of the metal is:

1.  2.5eV

2.  3.1eV

3.  0.9eV

4.  1.5eV

Concept Questions :-

Einstein photo-electric equation
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The concept of matter-wave was given by:

1.  de-Broglie

2.  Einstein

3.  Maxwell

4.  Bohr

Concept Questions :-

De-broglie wavelength
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When the light of wavelength λ is used in a photoelectric experiment, the maximum kinetic energy of emitted electrons is found to be K. What will the maximum kinetic energy of the photoelectrons when the light of wavelength λ2 is used instead of λ:

1. Zero

2. Non zero but less than 2 K

3. 2K

4. More than 2K

Concept Questions :-

Einstein photo-electric equation
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