1.
What is the de-Broglie wavelength associated with an electron accelerated through a potential difference of 900 V?

2.
The ratio of the energy of a photon with λ = 150 nm to that with λ = 300 nm is-

3.
The following graph shows the variation of photocurrent for a photosensitive metal. Choose the correct statement.

5.
In photoelectric effect, the photocurrent-

6.
The graph of kinetic energy of emitted electron with frequency of incident radiation is plotted as shown in figure. The slope of the graph is-

7.
The maximum kinetic energy of the photoelectrons varies-

8.
If light of wavelength 412.5 nm is incident on each of the metals given below, which ones will show photoelectric emission?

**Metal** | **Work Function (eV)** |

Na | 1.92 |

K | 2.15 |

Ca | 3.20 |

Mo | 4.17 |

9.
If the de-Broglie wavelengths for a proton and an alpha particle are equal, then the ratio of their velocities will be-

10.
Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?