Indicate which of the following photons can cause the emission of photoelectrons from a surface of gallium ($\varPhi$= 6.7 * 10^-19 J).

Question

Quizplus · Accepted Answer

The energy of a photon is inversely proportional to its wavelength. The shorter the wavelength, the higher the energy. The work function of gallium is 6.7 x 10^-19 J. Only photons with energy equal to or greater than this can cause photoemission. The energy of a 200 nm photon is higher than the work function, allowing it to emit photoelectrons.

Indicate Which of the Following Photons Can Cause the Emission Φ\varPhiΦ

Indicate Which of the Following Photons Can Cause the Emission $\varPhi$