It is observed that, when a metal surface is illuminated, electrons are either released immediately or they are not released at all. Suggest why this observation does not support a wave theory of light.
Without carrying out any calculation, suggest why no value is listed for $E_K$ for radiation of wavelength $650\,\text{nm}$.
Use the information in Fig. 7.1 to find the work function energy of the surface.
Radiation of wavelength $240\,\text{nm}$ produces a maximum photoelectric current $I$. The intensity of the incident radiation is kept constant and the wavelength is now reduced. State and explain the effect of this change on the maximum kinetic energy of the photoelectrons.
Radiation of wavelength $240\,\text{nm}$ produces a maximum photoelectric current $I$. The intensity of the incident radiation is kept constant and the wavelength is now reduced. State and explain the effect of this change on the maximum photoelectric current $I$.