Tutorials in Introductory Physics
Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Chapter 28.2, Problem 1TH

Consider the experiment shown in the figure at right. An evacuated tube contains two electrodes, A and B. Monochromatic light of λ = 250 n m is incident on electrode B, which is made of nickel ( ϕ = 5.2 e V ) .

Chapter 28.2, Problem 1TH, Consider the experiment shown in the figure at right. An evacuated tube contains two electrodes, A
When the voltage across the electrodes is zero volts, the ammeter reads zero current.

Would the ammeter read zero current or a non-zero current if you were to:

  • Double the intensity of the light source? Explain.
  • Increase the voltage across the electrodes from 0 V to + 5.5 V ? Explain.
  • Replace the nickel electrode with one made of aluminum ( ϕ = 4.2 e V ) ? Explain.

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Spectra Interference: Crash Course Physics #40; Author: CrashCourse;https://www.youtube.com/watch?v=-ob7foUzXaY;License: Standard YouTube License, CC-BY