Homework Help: Gen Chem

Posted by Z on Monday, January 18, 2010 at 2:08am.

Light of wavelength 272 nm shines on a piece of magnesium metal. What is the speed of the ejected electron? (Light energy greater than that of the work function of magnesium ends up as kinetic energy of the ejected electron. The work function is the minimum energy needed to eject an electron from the metal by irradiating it with light. The photoelectric work function for magnesium is 5.90 10-19 J.)

Gen Chem - bobpursley, Monday, January 18, 2010 at 9:31am
Energyphoton-workfunction=KE ejected electron

So what portion of this do you need help with? Consider Planck's equation.

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