The work function (Φ) for a metal is 7.80×10-19 J. What is the longest wavelength of...
The work function (Φ) for a metal is 7.80×10-19 J. What is the longest wavelength of electromagnetic radiation that can eject an electron from the surface of a piece of the metal?
Homework Answers
Longest wavelength = hc / Work function .
Work function =7.80×10-19J
h= plank's constant =6.626×10-34Js
c=velocity of light in vacuum =3×108m/s
Longest wavelength =( 6.626×10-34Js ×3×108m/s)/7.80×10-19
= 2.54×10-7m. =254nm.
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