Question

Could you please explain in detail so that I understand it completely, I'm not very familiar with science. Thank you!

8.(9 pts) Consider a metal for which the photoelectric effect is possible with a maximum wavelength in the blue region of the spectrum. Infrared, red, yellow, violet and ultraviolet beams are successively directed at the metal. a. Which, if any, of these "colors" will cause electrons to be ejected from the surface and why? b. Which beam will result in ejected electrons with the most energy? Explain your choi c. What will happen and why if you change the intensity of the light used in part (b)? ce.

Answer 1

Condition photoelectric effect KE_as electron = hv - phi Instated < red < yellow < blue < violet < ultraviolet light frequency with increasing order. a) Here photoelectric effect 2's starting from maximum wavelength of blue region (work func^n). so its your light frequency is less than work hence, electron will not eject. Therefore violet and ultraviolet beams will eject electron b) Ultraviolet beam will result in ejected electron with the most, because this has higher frequency c) If you change the intensity of light, your no. of ejected electron will vary, but Kinetic energy will remain same.