Two monochromatic light beams of equal power strike identical photoemissive surfaces
PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation
Problem
Two monochromatic light beams of equal power strike identical photoemissive surfaces.
• Beam X has a frequency 1.2 times the threshold frequency of the surface.
• Beam Y has a frequency 0.9 times the threshold frequency but delivers twice as many photons per second as Beam X.
Indicate which beam, if any, causes electron emission and compare the maximum kinetic energies of any emitted electrons.