A metal with a 500 nm red border of the photoelectric effect is illuminated by radiation with a frequency of 7.5 x 10 ^ 14 Hz.

A metal with a 500 nm red border of the photoelectric effect is illuminated by radiation with a frequency of 7.5 x 10 ^ 14 Hz. What can be the maximum speed of photoelectrons?

The energy of the light quantum hv is used to perform the work function A and to accelerate the electron to energy mV² / 2:
hv = A + (mV²) / 2.
The work function is numerically equal to the energy of the photon with the frequency of the red border. Since the wavelength of the red border is given, the corresponding frequency can be found through the wavelength and speed of light.
Answer: Maximum speed – 186314 m / s