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Author Question: An originally neutral electroscope is grounded briefly while a positively charged glass rod is held ... (Read 39 times)

Evvie72

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  • Posts: 519
on: Jul 29, 2018
An originally neutral electroscope is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, the electroscope
 
  A)
 
  remains neutral.
  B)
 
  is negatively charged.
  C)
 
  is positively charged.
  D)
 
  could be either positively or negatively charged, depending on how long the contact with ground lasted.

Question 2

A beam of white light of a certain frequency is incident on a metal surface. If the work function of this surface is 2.20 eV,
 
  what frequency of light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface?
  A)
 
  2.05  1014 Hz
  B)
 
  1.02  1014 Hz
  C)
 
  2.50  1014 Hz
  D)
 
  3.53  1014 Hz
  E)
 
  5.92  1014 Hz


amcvicar

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

B

Answer to Question 2

E


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