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Question 15 asks us to find a couple of things about an electromagnetic wave based on the function shown here.
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For part a, we're going to find the wavelength.
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For part b, we're going to find the frequency and part c you want to find the, well, not the electric field amplitude.
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Of course, that would be silly.
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We want the magnetic field amplitude.
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I'll go ahead and erase that.
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There we go.
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There we have an electric field amplitude simply in the equation as we'll get to.
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And we'll talk about that.
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For the wavelength, you need to take our spatial frequency term given here and we can just divide that by two pi so two pi divided by this frequency term 6 .28 times 10 to the 8 and the question tells us that x has units of meters which means that this spatial frequency term has to have units of 1 over meters and by doing this we can find that the wavelength of our emm wave here is 1 .0 times 10 to the negative 8 meters and then for part b, using the relationship between linear frequency and wavelength, we can use this expression to solve for the frequency to simply be the speed of light over the wavelength that we found from part a...