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Author Question: A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV. ... (Read 123 times)

jparksx

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on: Jul 29, 2018
A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV. If a 1.0-V stopping potential is required to make the electron current zero,
 
  what is the wavelength of light? (c = 3.00  108 m/s, h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J)
  A) 355 nm
  B) 423 nm
  C) 497 nm
  D) 744 nm

Question 2

When it is struck by 240-nm photons, a material having a work function of 2.60 eV emits electrons. What is the maximum kinetic energy of the emitted electrons?
 
  (c = 3.00  108 m/s, h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J)
  A) 2.58 eV
  B) 5.18 eV
  C) 2.00 eV
  D) 4.21 eV
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chereeb

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Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

A


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