A metal having a work function of 2.5 eV is illuminated with ...

[evelyn o bentley]

A metal having a work function of 2.5 eV is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm.
 
  For which one of the following ranges of the wavelength band in this white light are photoelectrons NOT produced? (h = 6.626  10-34 J  s,
  c = 3.00  108 m/s, 1 eV = 1.60  10-19 J)
  A) 500 nm to 700 nm
  B) 400 nm to 560 nm
  C) 500 nm to 560 nm
  D) 400 nm to 500 nm
  E) 560 nm to 700 nm

Question 2

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) 220 nm
  B) 150 nm
  C) 360 nm
  D) 1100 nm

[juliaf]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: A

[evelyn o bentley]

Thanks

[juliaf]

Welcome