Question: Calculation 4: Identifying the unknown material E, =hf - W - rearranging - W = h f - Ex Given: h = 4.14 x 10-15

Calculation 4: Identifying the unknown material E, =hf - W -

rearranging - W = h f - Ex Given: h = 4.14

Calculation 4: Identifying the unknown material E, =hf - W - rearranging - W = h f - Ex Given: h = 4.14 x 10-15 eV's f = 2 x 1015 Hz E, = - 7.23 x 10-19 eV Required: W =? Analysis and Solution: W = hf - Ek W = (4.14 x 10-15 eV.s)(2 x 1015 Hz) - (- 7.23 x 10-19 eV) W = 8.28

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