A Pair of Silver Plates in a Vacuum Are Separated

question 22

Multiple Choice

A pair of silver plates in a vacuum are separated by 1 cm and have a potential difference of 2.0 kV between them.What is the largest wavelength of light that can be shined on the cathode to produce a current through the anode?

• A)1.2 * 10^-11 m
• B)8.0 * 10^-11 m
• C)9.8 * 10^-11 m
• D)6.2 * 10^-10 m
• E)1.2 * 10^-9 m

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