Answer Happy

Photoelectric Effect and Solar Cells: A certain material with a work function of 2.0 eV is used in solar cells to generate the photoelectrons using sunlight. (15 points) (a) What is the cut-off frequency (in Hz) and the cut-off wavelength (in nm) of the material? 2.07. 1.602170-9J= 3, 204X10-14 Ehc 676261276341232.99798106ms 3.2 (6) Near the surface of the Earth, the intensity of sunlight peaks at a wavelength 500 nm. What is the stopping potential of the material corresponding to this wavelength? (c) If visible region of the sunlight extend from 400 nm to 700 nm, what range of wavelengths in this region would not produce the photoelectrons in this material? (d) What is the maximum speed of the emitted photoelectrons in (b)? KE max Vmax = 2.0.66 (e) If we want to increase the number photoelectrons emitted what should be done? Increase/decrease the incident light intensity, increase/decrease the frequency of the incident light, etc. Explain your answer.