Surface of certain metal is first illuminated with light of wavelength _{1}=350mm and then, by light of wavelength _{2}=54Dmm, it is found that the maximum speed of the photon electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to:

(Energy of photon= eV)

a. |
1.8 |
b. |
1.4 |

c. |
2.5 |
d. |
5.6 |

Surface of certain metal is first illuminated with light of wavelength _{1}=350mm and then, by light of wavelength _{2}=54Dmm, it is found that the maximum speed of the photon electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to:

(Energy of photon= eV)

a. |
1.8 |
b. |
1.4 |

c. |
2.5 |
d. |
5.6 |

1 Answer

127 votes

= + (2v)^{2}

= + mv^{2}

= 4

=3

=

= 1240

=1.8 eV

127 votes

127