In a photoelectric effect experiment, electrons emerge from a ...

[SAVANNAHHOOPER23]

In a photoelectric effect experiment, electrons emerge from a copper surface with a maximum kinetic energy of 1.10 eV when light shines on the surface. The work function of copper is 4.65 eV.
 
  Which one of the following values is closest to the wavelength of the light? (h = 6.626  10-34 J  s, c = 3.00  108 m/s, 1 eV = 1.60  10-19 J)
  A) 360 nm B) 150 nm C) 1100 nm D) 220 nm

Question 2

A reversible engine takes in heat at a rate of 555 W and exhausts heat at 482 W.
 
  (a) How much power does it produce?
  (b) What is its efficiency?
  (c) If operated in reverse as a refrigerator, what would be its performance coefficient (COP)?

[Chocorrol77]

Answer to Question 1

D

Answer to Question 2

(a) 73 W (b) 13.2 (c) 6.6