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**RS012**) A diffraction grating has 300 lines per mm. That is illuminated with monochromatic irradiate of wavelength 540nm. Calculate the edge of the second order maximum giving your answer come the proper number of far-reaching figures. So far i recognize you use the equation dsin(theta) = n-lambda and also then rearrange because that sin(theta), mine calculations are 540*10^-9(*2)/3.3*10^-6 and then the answer i execute is sin^-1(ans) to obtain the angle 1.875...*10^-11 yet the prize in the mark scheme is 18.9 levels i dont understand what i did wrong, maybe its other obvious.

I think you have made an error in entering whatever into your calculator. I have actually used the very same numbers as you and got the couchsurfingcook.comrrect answer. Your answer is quite far out for it to it is in simply as result of your calculator gift in radians, although i would likewise check to see if you"re in degrees. I typed right into my calculator: and got the couchsurfingcook.comrrect answer.

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