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

Subtopic:  Einstein's Photoelectric Equation |
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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

 

Subtopic:  Davisson & Germer Experiment (OLD NCERT) |
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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

Subtopic:  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

Subtopic:  Photoelectric Effect: Experiment |
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A particle of mass \(M\) at rest decays into two masses \(m_{1}\) and \(m_{1}\) having non-zero velocities. What will be the ratio of their de-Broglie wavelengths?
1. \(\frac{m_1}{m_2} \) 2. \(\frac{m_2}{m_1} \)
3. \(1 \) 4. \(\sqrt{\frac{\mathrm{m}_2}{\mathrm{~m}_1}}\)
Subtopic:  De-broglie Wavelength |
 50%
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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

Subtopic:  Einstein's Photoelectric Equation |
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Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the accelerating voltage is reduced to 6.25 kV, the resolving power of the microscope would:

1. Increase to 4 time

2. Increases to 2 times

3. Decrease to half

4. Decrease to 1/4th

Subtopic:  De-broglie Wavelength |
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In a photoelectric experiment using a metal of work function 1.8 eV, if the maximum kinetic energy of emitted electrons is 1.5eV, then the corresponding value to stopping potential is:

1.  1.8V

2.  3.3V

3.  0.3V

4.  1.5V

Subtopic:  Photoelectric Effect: Experiment |
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Monochromatic radiation emitted when an electron in a hydrogen atom jumps from the first excited state to the ground state irradiates a photosensitive material. The stopping potential is found to be 4V. The threshold wavelength of the material is

1. 2×10-7 m
2. 2×10-6 m
3. 4×10-7 m
4. 4×10-6  m

Subtopic:  Einstein's Photoelectric Equation |
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Photons with energy \(5\) eV are incident on a cathode \(C\) in a photoelectric cell. The maximum energy of emitted photoelectrons is \(2\) eV. When photons of energy \(6\) eV are incident on \(C\), no photoelectron will reach the anode \(A\), if the stopping potential of \(A\) relative to \(C\) is:
1. \(+3\) V
2. \(+4\) V
3. \(-1\) V
4. \(-3\) V

Subtopic:  Einstein's Photoelectric Equation |
 52%
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