Determine the longest wavelength of light required to remove an electron from a sample of potassium metal, if the binding energy for an electron in K is 1.76 × 103 kJ/mol.

Answer 1

isn't Planck's equation working?

Energy= plancksconstant*speedlight/wavelength

You will have to get energy per electron, or

energy= 1.76E3*1E3avagradros number to get energy in joules/electron

Answer 2

opps, division sign disappeared.

\
energy= 1.76E3*1E3/ avagradros number to get energy in joules/electron