Question

the photoelectric threshold for a certain metal is 3600 angstrom when source is placed at 1 metre from the target determine the maximum energy electron volt of the electron ejected by the radiation of wavelength 2000 angstrom. what will be the effect on stopping potential and number of ejected photoelectrons when source is shifted to 30cm​

Answer 1

Answer:

Here, Threshold wavelength,

Incident wavelength,

According to Einstein's photoelectric equation