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Q. No.If the momentum of an electron is changed by \(p\), then the de-Broglie wavelength associated with it changes by \(0.5\%\). What is the initial momentum of the electron?
1. \(200p\)
2. \(400p\)
3. \(\frac{p}{200}\)
4. \(100p\)
Subtopic: De-broglie Wavelength |
63%
Level 2: 60%+
NEET - 2012
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When monochromatic radiation of intensity \(I\) falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are \(N\) and \(T\) respectively. If the intensity of radiation is \(2I\) what is the number of emitted electrons and their maximum kinetic energy?
| 1. | \(N\) and \(2T\) | 2. | \(2N\) and \(T\) |
| 3. | \(2N\) and \(2T\) | 4. | \(N\) and \(T\) |
Subtopic: Photoelectric Effect: Experiment |
83%
Level 1: 80%+
NEET - 2010
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A helium-neon laser produces monochromatic light of a wavelength of \(667~\text{nm}.\) The power emitted is \(9~\text{mW}.\) The average number of photons arriving per second on average at a target irradiated by this beam is:
1. \(9\times 10^{17}\)
2. \(3\times 10^{16}\)
3. \(9\times 10^{15}\)
4. \(3\times 10^{19}\)
1. \(9\times 10^{17}\)
2. \(3\times 10^{16}\)
3. \(9\times 10^{15}\)
4. \(3\times 10^{19}\)
Subtopic: Particle Nature of Light |
80%
Level 1: 80%+
NEET - 2009
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Waves are associated with matter only:
| 1. | When it is stationary. |
| 2. | When it is in motion with the velocity of light only. |
| 3. | When it is in motion with any velocity. |
| 4. | None of the above. |
Subtopic: De-broglie Wavelength |
59%
Level 3: 35%-60%
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A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:
| 1. | Equal to \(c\), the speed of light in vacuum. |
| 2. | Greater than \(c\). |
| 3. | Less than \(c\). |
| 4. | Tending to infinity. |
Subtopic: De-broglie Wavelength |
78%
Level 2: 60%+
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If the following particles are moving at the same velocity, then which among them will have the maximum de-Broglie wavelength?
1. Neutron
2. Proton
3. \(β
-\)particle
4. \(α
-\)particle
Subtopic: De-broglie Wavelength |
61%
Level 2: 60%+
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What is the momentum of a photon in an \(X\text-\)ray beam of \(10^{-10}\) meter wavelength?
| 1. | \(1.5 \times 10^{-23}~\text{kg-m/s}\) |
| 2. | \(6.6 \times 10^{-24}~\text{kg-m/s}\) |
| 3. | \(6.6 \times 10^{-44}~\text{kg-m/s}\) |
| 4. | \(2.2 \times 10^{-52}~\text{kg-m/s}\) |
Subtopic: De-broglie Wavelength |
91%
Level 1: 80%+
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The energy of quanta of frequency \(10^{15}~\text{Hz}\) and \(h = 6.6 \times 10^{-34}~\text{J-s}\) will be:
1. \(6.6\times 10^{-19}~\text{J}\)
2. \(6.6\times 10^{-12}~\text{J}\)
3. \(6.6\times 10^{-49}~\text{J}\)
4. \(6.6\times 10^{-41}~\text{J}\)
1. \(6.6\times 10^{-19}~\text{J}\)
2. \(6.6\times 10^{-12}~\text{J}\)
3. \(6.6\times 10^{-49}~\text{J}\)
4. \(6.6\times 10^{-41}~\text{J}\)
Subtopic: Particle Nature of Light |
92%
Level 1: 80%+
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The number of photo-electrons emitted per second from a metal surface increases when:
| 1. | The energy of incident photons increases. | 2. | The frequency of incident light increases. |
| 3. | The wavelength of the incident light increases. | 4. | The intensity of the incident light increases. |
Subtopic: Photoelectric Effect: Experiment |
82%
Level 1: 80%+
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A photon of energy \(3.4~\text{eV}\) is incident on a metal having a work function of \(2~\text{eV}.\) The maximum \(K.E\) of photo-electrons is equal to:
| 1. | \(1.4~\text{eV}\) | 2. | \(1.7~\text{eV}\) |
| 3. | \(5.4~\text{eV}\) | 4. | \(6.8~\text{eV}\) |
Subtopic: Einstein's Photoelectric Equation |
92%
Level 1: 80%+
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