Lab 27 1. Bring up the internet and go to the following site: http://phet.colorado.edu/indeX.php 2. Look for ?Run our Simulations?, click ?On Line?, then ?Light and Radiation? (in the left hand column), then ?Photoelectric Effect?, then ?Run Now?. 3. Keep battery voltage at 0. Turn light intensity up to 100%. You will be testing sodium first (metals are changeable in the upper right hand box). 4. Adjust wavelength to a value which just allows electrons to leave the surface at a lowest possible speed. 5. Calculate W in electron volts using the following values and formulas: c = )W, where c = 2.998E17 nm/sec, 7? is in nm and V is in s'1 h = 6.626E-34 J-s 1 electron volt = 1.6021 7646 x 10'19joules hV = Ek + W ***remember?Ek is set at zero .0\ Calculate work function (in eV) for all other metals, including the mystery metal. 7. Look up work function values on the internet. Identify the mystery metal, and check the values obtained for the other metals.
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I am told the metal is actually Magnesium
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