Recent content by helloween0908

oh, thanks. The problem seems clear now :D

Is this what you mean: The Bragg's law becomes: the length of the red+ blue lines = d(sin θ + sin θ’ ) = mλ

problem: In Bragg's law equation, mormally, we measure the angle θ from the surface If instead the light strikes the grating at an angle of incident θ’ (measured from the normal), show that the condition for an intensity maximum is not 2dsin θ= mλ (m=1,2,3...) but rather d(sin θ + sin θ’ ) =...

This is actually a question extracted from the physics book by Halliday. How would you suggest measuring the temperature of (a) the Sun, (b) the Earth's upper atmosphere, (c) an insect, (d) the Moon, (e) the ocean floor and (f) liquid Helium? Thanks first.:smile: