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Author Question: When a photoelectric surface is illuminated with light of wavelength 437 nm, the stopping potential ... (Read 29 times)

audie

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on: Jul 29, 2018
When a photoelectric surface is illuminated with light of wavelength 437 nm, the stopping potential is measured to be 1.67 V.
 
  (1 eV = 1.60  10-19 J, e = 1.60  10-19 C, melectron = 9.11  10-31 kg, h = 6.626  10-34 J  s)
  (a) What is the work function of the metal, in eV?
  (b) What is the maximum speed of the ejected electrons?

Question 2

A tiny 0.0250-g oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces.
 
  The plates are both circular with a radius of 6.50 cm. (k = 1/40 = 9.0  109 N  m2/C2, e = 1.6  10-19 C)
  (a) How much excess charge must be on each plate to hold the oil drop steady?
  (b) Which plate must be positive, the upper one or the lower one?


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Cnarkel

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

(a) 1.17 eV (b) 7.66  105 m/s

Answer to Question 2

(a) 12.0 C (b) upper plate


audie

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Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


Cnarkel

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Reply #3 on: Jul 29, 2018
Great! Please up vote :D


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