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-State the Bragg’s law mathematically. -X-rays are incident normally on a crystal lattice constant 0.6 nm. The first order reflection occurs at an angle 300. What is the wavelength of X-rays used? -Lists four properties of X-rays -What is an electron volt? -A metal has a work function 3.0 eV illuminated by light of wavelength 0.6 nm. Calculate the: threshold frequency maximum kinetic energy of photo electrons in electron volt (h = 6.63 x 10-34 Js, c = 3.0 x 108 m/s, e = 1.6 x 10-19 C) -What is the difference between Compton effect and photoelectric effect? -The radius of our Sun is 6.96 x 108 m, and its total power output is 3.85 x 1026 W. Assuming the Sun’s surface emits as a black body, calculate: -its surface temperature -the maximum wavelength of light from the Sun. ( = Wm-2K-4, c = mK) -What does Einstein’s special theory of relativity state about the laws of Physics? -What are radioisotopes? - State 2 differences between nuclear fission and nuclear fusion.
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