Sapling Homework


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805377003
Posts: 102
Joined: Wed Sep 30, 2020 10:10 pm

Sapling Homework

Postby 805377003 » Thu Oct 22, 2020 1:16 pm

Can someone explain how to do this problem?

As you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your friends are arguing over the cause of the sparking, with one stating that the microwaves "herd" electrons into "pointy" areas of the metal object, from which the electrons jump from one part of the object to another. The other friend says that the sparks are caused by the photoelectric effect. Prove or disprove the latter idea using basic physics.

Suppose the typical work function of the metal is roughly 4.570×10−19 J. Calculate the maximum wavelength in angstroms of the radiation that will eject electrons from the metal.

Chem_Mod
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Re: Sapling Homework

Postby Chem_Mod » Thu Oct 22, 2020 1:32 pm

To solve this problem, know that the work function is equal to the minimum energy to eject an electron. Therefore, use this value and the equations c=(wavelength)(frequency) and E=h(frequency) to solve for the wavelength and then use dimensional analysis to find an answer in Angstroms!

kateraelDis1L
Posts: 104
Joined: Wed Sep 30, 2020 9:54 pm

Re: Sapling Homework

Postby kateraelDis1L » Thu Oct 22, 2020 1:51 pm

to add on^ an Angstrom unit of length is mostly used in measuring wavelengths of light, equal to 10^-10 meter or 0.1 nanometer.


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