If V be the accelerating voltage, then the maximum frequency of continuous x-rays is given by

1.

2.

3.

4. $\frac{h}{eV}$

Subtopic:  Photoelectric Effect: Experiment |
63%
From NCERT
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The maximum kinetic energy of photoelectron emitted from the surface of work function f due to incidence of light of frequency n is E. If the frequency of incident light is doubled, then maximum kinetic of emitted photon will be

1.  2E

2.  2E - f

3.  2E + f

4.  2E + 2f

Subtopic:  Einstein's Photoelectric Equation |
52%
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What is the de-Broglie wavelength associated with an electron accelerated through a voltage of $$900$$ V?
1. $$0.31~\mathring{A}$$
2. $$0.41~\mathring{A}$$
3. $$0.5~\mathring{A}$$
4. $$0.16~\mathring{A}$$

Subtopic:  De-broglie Wavelength |
74%
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What is the de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature $$T$$ (Kelvin) and mass $$m$$?
1. $$\frac{h}{\sqrt{m k T}}$$
2. $$\frac{h}{\sqrt{3 m k T}}$$
3. $$\frac{2 h}{\sqrt{3 m k T}}$$
4. $$\frac{2 h}{\sqrt{m k T}}$$
Subtopic:  De-broglie Wavelength |
80%
From NCERT
NEET - 2017
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If an electron of mass $$m$$ with a de-Broglie wavelength of $$\lambda$$ falls on the target in an $$X\text-$$ray tube, the cut-off wavelength $$(\lambda_0)$$ of the emitted $$X\text-$$ray will be:
1. $$\lambda_0 = \frac{2mc\lambda^2}{h}$$
2. $$\lambda_0 = \frac{2h}{mc}$$
3. $$\lambda_0 = \frac{2m^2c^2\lambda^3}{h^2}$$
4. $$\lambda_0 = \lambda$$

Subtopic:  De-broglie Wavelength |
From NCERT
NEET - 2016
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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 |
51%
From NCERT
NEET - 2016
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When a metallic surface is illuminated with radiation of wavelength $\lambda$, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2$\lambda$, the stopping potential is $\frac{V}{4}$ .The threshold wavelength for metallic surface is:

(a) 5$\lambda$                (b)$\frac{5}{2}$$\lambda$

(c) 3$\lambda$                (d) 4$\lambda$

Subtopic:  Photoelectric Effect: Experiment |
65%
From NCERT
NEET - 2016
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An electron of mass m and a photon have the same energy E. Find the ratio of de-Broglie wavelength associated with the electron to that associated with the photon. (c is the velocity of light)

$1.$ ${\left(\frac{E}{2m}\right)}^{1/2}$

$2.$ $c{\left(2mE\right)}^{1/2}$

$3.$ $\frac{1}{c}{\left(\frac{2m}{E}\right)}^{1/2}$

$4.$ $\frac{1}{c}{\left(\frac{E}{2m}\right)}^{1/2}$

Subtopic:  De-broglie Wavelength |
59%
From NCERT
NEET - 2016
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A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c=velocity of light)

1. E/c

2. 2E/c

3. 2E/c2

4. E/c2

Subtopic:  Particle Nature of Light |
59%
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 light of wavelength $$2\lambda$$, the stopping potential is $$V_0$$. The photoelectric effect's threshold wavelength for this surface is?
1. $$6\lambda$$
2. $$4\lambda$$
3. $$\frac{\lambda}{4}$$
4. $$\frac{\lambda}{6}$$

Subtopic:  Einstein's Photoelectric Equation |
77%
From NCERT
NEET - 2015
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