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Photoelectric Vending Machine

Photoelectric Vending Machine . Nathan Miller Univ. of Wisconsin Eau Claire. Table of Analogies:. Basic classical exchange Money in  Chocolate out A “class” has a certain amount of money, they should be able to buy a certain amount of chocolate.

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Photoelectric Vending Machine

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  1. Photoelectric Vending Machine Nathan Miller Univ. of Wisconsin Eau Claire

  2. Table of Analogies:

  3. Basic classical exchange • Money in  Chocolate out • A “class” has a certain amount of money, they should be able to buy a certain amount of chocolate

  4. Say you have class of 100 students, with $65 dollars between them. They should be able to buy 6500g of chocolate. • But if they each have $0.65 and each walk by the vending machine, they don’t get a single candy bar. • This is like shining red light on the surface – no matter how much you shine, no electrons is emitted.

  5. Now say you have a class of 10 students, and each has a dollar. • They can now buy 1000 grams of chocolate in total • This time they can in fact buy the candy bars, but there is no energy left over. • This is like blue light at the critical frequency – electrons are ejected, but no KE is left over.

  6. Finally, you have 2 people who have $1.50 each. • They can buy the candy bars, and each has 50 cents left over. • This is like ejecting electrons and giving them a certain amount of kinetic energy.

  7. If you have a vending machine with 65 cent candy bars or $1.10 candy bars, these would correspond to different work functions.

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