Please explain your answers and answer all the blanks, unlike last time. There a
ID: 1402209 • Letter: P
Question
Please explain your answers and answer all the blanks, unlike last time. There are FIVE blanks that need to be filled, TWO for A. and THREE for B. Thanks!
In the photoelectric effect, light strikes a metal and photoelectrons are ejected.
(a) If the intensity of the light is increased, while the frequency is kept constant, the maximum kinetic energy of the photoelectrons will (increase, decrease, stay the same) while the rate of photoelectrons will (increase, decrease, stay the same).
(b) If the frequency of the light is increased, while the intensity is kept constant, the maximum kinetic energy of the photoelectrons will (increase, decrease, stay the same), while the rate of photons onto the metal will (increase, decrease, stay the same), so the rate of photoelectrons will (increase, decrease, stay the same). Hint: don't try the last (fifth) part until you understand the previous (fourth) part.
Explanation / Answer
Frequency is directly proportional to kinetic energy of photoelectrons, i.e., if frequency of incident radiation (above threshold frequency) increases kinetic energy of the photoelectron also increases. Similary, intensity is directly proportional to the no. of photoelectrons ejected.Intensity is directly proportional to no. of photons.
(a) remain the same, will increase
(b) will increase, will remain the same, will remain the same