Material $ (eV) 1. The cutoff wavelength for the photoelectric effect in a certain metal is 254 nm. (a) What is the work function for that metal? (b) Will the photoelectric effect be observed for 2>254 nm or for 1 < 254 nm? Na 2.28 Al 4.08 Co 3.90 Cu 4.70 2. When light of wavelength A illuminates a copper surface, the stopping potential is V. In terms of V, what will be the stopping potential if the same wavelength is used to illuminate a sodium surface? Zn 4.31 Ag 4.73 Pt 6.35 Pb 4.14

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Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.