Select Chapter Topics:

The photoelectric threshold wavelength of silver is \(3250\times 10^{-10}~\text{m}\). What will be the velocity of the electron ejected from a silver surface by the ultraviolet light of wavelength \(2536\times 10^{-10}~\text{m}\)? (Given \(h= 4.14\times 10^{-15}~\text{eVs}\)$$ and $\mathrm{}$\(c= 3\times 10^{8}~\text{m/s}\)${\mathrm{}}^{}$)

1. \(\approx 0.6\times 10^{6}~\text{m/s}\)

2. \(\approx 61\times 10^{3}~\text{m/s}\)

3. \(\approx 0.3\times 10^{6}~\text{m/s}\)

4. \(\approx 0.3\times 10^{5}~\text{m/s}\)

Subtopic: Einstein's Photoelectric Equation |

From NCERT

NEET - 2017

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

An electron of mass m with an initial velocity \(\overrightarrow v= v_0\hat i\)$\stackrel{}{}$\( ( v_o > 0 ) \) enters in an electric field \(\overrightarrow E = -E_0 \hat i\)\((E_0 = \text{constant}>0)\) at \(t=0\). If \(\lambda_0\)${\mathrm{}}_{}$

1. \(\frac{\lambda_0}{\left(1+ \frac{eE_0}{mv_0}t\right)}\)

2. \(\lambda_0\left(1+ \frac{eE_0}{mv_0}t\right)\)

3. \(\lambda_0 t\)

4. \(\lambda_0\)

Subtopic: De-broglie Wavelength |

67%

From NCERT

NEET - 2018

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

When the light of frequency \(2\nu_0\) (where \(\nu_0\) is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is \(v_1\). When the frequency of the incident radiation is increased to \(5\nu_0,\) the maximum velocity of electrons emitted from the same plate is \(v_2.\) What will be the ratio of \(v_1\) to \(v_2\)?

1. | \(1:2\) | 2. | \(1:4\) |

3. | \(4:1\) | 4. | \(2:1\) |

Subtopic: Einstein's Photoelectric Equation |

72%

From NCERT

NEET - 2018

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

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 the metallic surface is:

1. \(5\lambda\)

2. \(\frac{5}{2} \lambda\)

3. \(3\lambda\)

4. \(4\lambda\)

1. \(5\lambda\)

2. \(\frac{5}{2} \lambda\)

3. \(3\lambda\)

4. \(4\lambda\)

Subtopic: Einstein's Photoelectric Equation |

76%

From NCERT

NEET - 2016

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

An electron of mass \(m\) and a photon have the same energy \(E.\) The ratio of de-Broglie wavelengths associated with them is:

(\(c\) is the velocity of light)

1. \( \sqrt{\left(\frac{{E}}{2 {m}}\right)}\)

2. \({c}\sqrt{(2 {mE})}\)

3. \( \frac{1}{{c}}\sqrt{\left(\frac{2 m}{E}\right)}\)

4. \(\frac{1}{{c}}\sqrt{\left(\frac{{E}}{2 {m}}\right)}\)

Subtopic: De-broglie Wavelength |

69%

From NCERT

NEET - 2016

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

A photoelectric surface is illuminated successively by the monochromatic light of wavelength \(\lambda\) and \(\frac{\lambda}{2}\). If the maximum kinetic energy of the emitted photoelectrons in the second case is \(3\) times that in the first case, the work function of the surface of the mineral is:

[\(h\) = Plank’s constant, \(c\) = speed of light]

1. \(\frac{hc}{2\lambda}\)

2. \(\frac{hc}{\lambda}\)

3. \(\frac{2hc}{\lambda}\)

4. \(\frac{hc}{3\lambda}\)

Subtopic: Einstein's Photoelectric Equation |

72%

From NCERT

NEET - 2015

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

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

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

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

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

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. \(\frac{\lambda}{4}\)

4. \(\frac{\lambda}{6}\)

1. \(6\lambda\)

2. \(4\lambda\)

3. \(\frac{\lambda}{4}\)

4. \(\frac{\lambda}{6}\)

Subtopic: Einstein's Photoelectric Equation |

80%

From NCERT

NEET - 2015

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

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

To view explanation, please take trial in the course.

NEET 2025 - Target Batch

Hints

Links

To view explanation, please take trial in the course.

NEET 2025 - Target Batch