Question

current attempt in progress
which one of the following statements about the photoelectric effect and the electron is false?
below a threshold frequency of light, no electrons are ejected
increasing the intensity of the light increases the number of ejected electrons
the kinetic energy of the emitted electron is equal to the energy of the photon plus the binding energy of the electron
all metals exhibit photoelectric effect
the energy of the photon corresponds to the energy required to eject the electron

Explanation:

The photoelectric - effect equation is $K_{max}=h
u - \varphi$, where $K_{max}$ is the maximum kinetic energy of the ejected electron, $h
u$ is the energy of the incident photon, and $\varphi$ is the work - function (binding energy) of the electron. So the kinetic energy of the emitted electron is the energy of the photon minus the binding energy of the electron. Also, below a threshold frequency, no electrons are ejected as photons don't have enough energy to overcome the work - function. Increasing light intensity means more photons, thus more electrons are ejected. All metals can exhibit the photoelectric effect under the right conditions. The energy of the photon must be at least equal to the energy required to eject the electron.

Answer:

The kinetic energy of the emitted electron is equal to the energy of the photon plus the binding energy of the electron.