As you may well know, placing metal object inside a microwave oven can generate

Question

As you may well know, placing metal object inside a microwave oven can generate sparks. Two of your friends are arguinug over the cause of the sparking, with one stating that the microeavesherd" electrons into pointy" areas of the metal object, from which the electrons jump from one part of the object to another. Write down an equation for the energy of the electrons knocked out of the metal, E_0, in relation to the frequency of the incident light, f, and the work function, w. Calculate the minimum frequency frequency radiation (in units of Hz) that will eject electrons from Considering that microwave evens radiate at 2.45 GHz (1 GHz = 10^3 Hz), how would you respond to the debate? Which explanation is correct. and why?

Explanation / Answer

a) h*f = Ee+W

h is the planck's constant

b) W = h*fmin = 4.99*10^-19

f_min = 4.99*10^-19/(6.625*10^-34) = 7.53*10^14 Hz

C) since 2.45*10^9 Hz < 7.53*10^14 Hz ,then the cocept of photoelectric effect is wrong to eject electrons

to eject electrons from the metal surface f_min must be greater than or equal to 7.53*10^14

So the second friend who is going with photoelectric effect is wrong

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