# <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 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. $\mathrm{\beta }$-particle              4. $\mathrm{\alpha }$-particle

Subtopic:  De-broglie Wavelength |
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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 |
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The energy of a quanta of frequency $$10^{15}$$ 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. $$6.6\times 10^{-41}~\text{J}$$

Subtopic:  Particle Nature of Light |
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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 |
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A photon of energy $$3.4$$ eV is incident on a metal having a work function of $$2$$ eV. The maximum K.E of photo-electrons is equal to:
 1 $$1.4$$ eV 2 $$1.7$$ eV 3 $$5.4$$ eV 4 $$6.8$$ eV
Subtopic:  Einstein's Photoelectric Equation |
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A photocell is receiving light from a source placed at a distance of $$1$$ m. If the same source is placed at a distance of $$2$$ m, then the ejected electron:
 1 moves with one-fourth of energy as that of the initial energy. 2 moves with one-fourth of momentum as that of the initial momentum. 3 will be half in number. 4 will be one-fourth in number.
Subtopic:  Electron Emission |
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The stopping potential for photoelectrons:

 1 does not depend on the frequency of the incident light. 2 does not depend upon the nature of the cathode material. 3 depends on both the frequency of the incident light and the nature of the cathode material. 4 depends upon the intensity of the incident light.
Subtopic:  Photoelectric Effect: Experiment |
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If in a photoelectric experiment, the wavelength of incident radiation is reduced from $$6000~\mathring{A}$$ to $$4000~\mathring{A}$$, then:
 1 The stopping potential will decrease. 2 The stopping potential will increase. 3 The kinetic energy of emitted electrons will decrease. 4 The value of the work function will decrease.
Subtopic:  Photoelectric Effect: Experiment |
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The value of stopping potential in the following diagram is given by:

 1 $$-4$$ V 2 $$-3$$ V 3 $$-2$$ V 4 $$-1$$ V
Subtopic:  Photoelectric Effect: Experiment |
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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 |
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