The work function of metal A is less than that of metal B. (a) The threshold wavelength

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The work function of metal A is less than that of metal B.
(a) The threshold wavelength for metal A is (1) shorter than, (2) the same as, (3) longer than that of metal B. Why?
(b) If the threshold wavelength for metal B is 620 nm and the work function of metal Ais twice that of metal B, what is the threshold wavelength for metal A?
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College Physics

ISBN: 978-0321601834

7th edition

Authors: Jerry D. Wilson, Anthony J. Buffa, Bo Lou

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