Question: In the x-ray tube, the anode is angled at a small angle to help reduce the x-ray beam dimension, which is kind of a focusing effect. Suppose the dimension (beam width) of the high-speed electron beam that is used to generate the x-ray radiation is 8 mm. The dimension (beam width) of the x-ray beam at the immediate output of the x-ray tube is 2 mm. Calculate the small anode angle [in degrees].

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Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.