Sapling Learning macmillan leaming you may well know, placing metal objects insi

Question

Sapling Learning macmillan leaming you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your riends 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. Theotherfriend says that the sparks are caused by the photoelectric effect. In this problem, we wil p ove or disprve the ater idea using Das idrp hyaicsd in this problem, Wwe Suppose the typical work function of the metal is roughly 4.800 x10-9 J. Calculate the maximum wavelength in angstroms of the radiation that will eject electrons from the metal. Number Considering that microwave ovens radiate at 2.45 GHz, how would you respond to the debate? O O The sparks cannot be caused by the photoelectric effect. The sparks could be caused by the photoelectric effect.

Explanation / Answer

A) Work function = hc / wavelength

So, wavelength = hc/ work function

wavelength = 6.63e-34*3e8 / 4.80e-19

wavelength = 4.143e-7 m

as we need this is angstrom,

1 m = 1e10 A

so, wavelength = 4143.8 A

This wavelength is less than the wavelength of over radiation (0.1223 m)

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