Question

Threshold wavelength for photoelectric emission from a metal surface is 5200.Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation

Answer 1

For photoelectric emission to take

Place, frequency of light should be more than it's wavelength . As frequency is directly proportional to kinetic energy , the light with maximum frequency cause photoelectric emission . As frequency of monochromatic light is 5×10^14 which is more than 5200 will cause photoelectric emission.