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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

Q2:

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Subtopic: Einstein's Photoelectric Equation |

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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. $0.16~\mathring{A}$

Q3:

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Subtopic: De-broglie Wavelength |

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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.	$\frac{2 h}{\sqrt{m k T}}$

Q4:

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Subtopic: De-broglie Wavelength |

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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. $\lambda_0 = \lambda$

Q5:

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Subtopic: De-broglie Wavelength |

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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

Q6:

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Subtopic: Einstein's Photoelectric Equation |

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When a metallic surface is illuminated with radiation of wavelength $λ$ , the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2 $λ$ , the stopping potential is $\frac{V}{4}$ .The threshold wavelength for metallic surface is:

(a) 5 $λ$ (b) $\frac{5}{2}$ $λ$

Q7:

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Subtopic: Photoelectric Effect: Experiment |

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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)

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

$2 .$ $c {(2 m E)}^{1 / 2}$

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

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

Q8:

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Subtopic: De-broglie Wavelength |

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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

Q9:

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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. $\dfrac{\lambda}{4}$
4. $\dfrac{\lambda}{6}$

Q10:

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Subtopic: Einstein's Photoelectric Equation |

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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.	\(\frac{2 h}{\sqrt{m k T}}\)