Use the Following Figure for the Next Two Questions $\times$ 10^-19 J

question 31

Multiple Choice

Use the following figure for the next two questions.
Apparatus for studying the photoelectric effect
-The work function of the material being investigated is 3.5 $\times$ 10^-19 J.The battery is set at 1.5 V.What is the longest wavelength of light needed to produce an electric current from the cathode (C) to the anode (A) ?

• A)337 nm
• B)354 nm
• C)620 nm
• D)827 nm
• E)None of these is correct.

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