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on ofan × tta.com/Common/TakeTutorialAssignment.aspx Home I S Class M t I Help hapter 29 Begin Date: 4/9/2018 1:00:00 AM-Due Date: 4/15/2018 11:55:00 PM End Date: 4/16/2018 11 55:00 PM (11%) Problem 1: The work function of an unknown metal is 4.35 ev What is the longest wavelength, in nanometers, of electromagnetic radiation that can eject a photoelectron from this metal? Grad Dedu Poten sino l coso l tano-leid 71-81-9 Subm cotan0 asin acosO atan() | acotan?I sinto coshO tan cotanho detail . Degrees Radians Hint Hints: 1% deduction per hant Hints remaining Feedback: 1 deduction per feedback

Explanation / Answer

Here ,

work function , W = 4.35 eV

for the largest wavelength

energy of photon = 4.35 = h * c/(wavelength * e)

4.35 = 6.626 * 10^-34 * 3 *10^8/(wavelength * 1.602 * 10^-19)

solving for wavelength

wavelength = 2.85 *10^-7 m

the longest wavelength is 2.85 *10^-7 m

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