# Light of wavelength $$500~\text{nm}$$ is incident on metal with work function $$2.28~\text{eV}$$. The de-Broglie wavelength of the emitted electron is: 1. $$< 2.8\times 10^{-10}~\text{m}$$ 2. $$< 2.8\times 10^{-9}~\text{m}$$ 3. $$\geq 2.8\times 10^{-9}~\text{m}$$ 4. $$\leq 2.8\times 10^{-12}~\text{m}$$

Subtopic:  De-broglie Wavelength |
61%
From NCERT
NEET - 2015
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Radiation of energy $$E$$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is:
($$c$$ = velocity of light)
1. $$E \over c$$
2. $$2E \over c$$
3. $$2E \over c^2$$
4. $$E \over c^2$$

Subtopic:  Particle Nature of Light |
72%
From NCERT
NEET - 2015
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A certain metallic surface is illuminated with monochromatic light of wavelength $$\lambda$$. The stopping potential for photoelectric current for this light is $$3V_0$$. If the same surface is illuminated with a light of wavelength $$2\lambda$$$\mathrm{}$, the stopping potential is $$V_0$$. The threshold wavelength for this surface for the photoelectric effect is:
 1 $$6\lambda$$ 2 $$4\lambda$$ 3 $$\dfrac{\lambda}{4}$$ 4 $$\dfrac{\lambda}{6}$$
Subtopic:  Einstein's Photoelectric Equation |
80%
From NCERT
NEET - 2015
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Which of the following figures represent the variation of the particle momentum and the associated de-Broglie wavelength?

 1 2 3 4
Subtopic:  De-broglie Wavelength |
87%
From NCERT
NEET - 2015
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When the energy of the incident radiation is increased by $$20\%$$, the kinetic energy of the photoelectrons emitted from a metal surface increases from $$0.5~\text{eV}$$ to $$0.8~\text{eV}$$. The work function of the metal is:
1. $$0.65~\text{eV}$$
2. $$1.0~\text{eV}$$
3. $$1.3~\text{eV}$$
4. $$1.5~\text{eV}$$

Subtopic:  Einstein's Photoelectric Equation |
71%
From NCERT
AIPMT - 2014
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If the kinetic energy of the particle is increased to $$16$$ times its previous value, the percentage change in the de-Broglie wavelength of the particle is:
1. $$25$$
2. $$75$$
3. $$60$$
4. $$50$$

Subtopic:  De-broglie Wavelength |
72%
From NCERT
AIPMT - 2014
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For photoelectric emission from certain metals, the cutoff frequency is $$\nu$$. If radiation of frequency $$2\nu$$$\mathrm{}$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be:
($$m$$ is the electron mass)

 1 $$\sqrt{\dfrac{h\nu}{m}}$$ 2 $$\sqrt{\dfrac{2h\nu}{m}}$$ 3 $$2\sqrt{\dfrac{h\nu}{m}}$$ 4 $$\sqrt{\dfrac{h\nu}{2m}}$$
Subtopic:  Einstein's Photoelectric Equation |
83%
From NCERT
AIPMT - 2013
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The wavelength $$\lambda_e$$ of an electron and $$\lambda_p$$ of a photon of the same energy $$E$$ are related by:
1. $$\lambda_p \propto \lambda_e$$
2. $$\lambda_p \propto \sqrt{\lambda_e}$$
3. $$\lambda_p \propto \frac{1}{\sqrt{\lambda_e}}$$
4. $$\lambda_p \propto \lambda_e^2$$
Subtopic:  De-broglie Wavelength |
60%
From NCERT
AIPMT - 2013
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A $$200~\text{W}$$ sodium street lamp emits yellow light of wavelength $$0.6~\mu\text{m}$$. Assuming it to be $$25\%$$ efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is:
1. $$1.5\times 10^{20}$$
2. $$6\times 10^{18}$$
3. $$62\times 10^{20}$$
4. $$3\times 10^{19}$$

Subtopic:  Particle Nature of Light |
70%
From NCERT
AIPMT - 2012
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An $$\alpha\text-$$particle moves in a circular path of radius $$0.83~\text{cm}$$ in the presence of a magnetic field of $$0.25~\text{Wb/m}^2$$. The de-Broglie wavelength associated with the particle will be:
1. $$1~\mathring{\text{A}}$$
2. $$0.1~\mathring{\text{A}}$$
3. $$10~\mathring{\text{A}}$$
4. $$0.01~\mathring{\text{A}}$$

Subtopic:  De-broglie Wavelength |
58%
From NCERT
AIPMT - 2012
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