This Is an Apparatus for Studying the Photoelectric Effect

question 48

Multiple Choice

This is an apparatus for studying the photoelectric effect. The work function of the material being investigated is 3.5 *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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