PHYS 1062 Lecture Notes - Lecture 11: Lattice Constant, Special Relativity, Time Dilation
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1. the biggest impact on society in the 1st half of 20th century is from the advances and applications of. 2. the biggest impact on society in the 2nd half of 20th century is from the advances and applications of. ______________: crystal structure & x-ray diffraction (section 36-10) -> x-ray diffraction: bragg condition: 2dsin =n , n=1 for the first order. Example: the lattice constant for a nacl structure is a=0. 282 nm. The wavelength of x-ray used for the experiment is 0. 12 nm. The laws of physics are the same in every inertia frame of reference. The speed of light in vacuum is the same in all inertia frames of reference and is independent of the motion of the source. This equation will be widely used in nuclear physics (will be discussed later). 38: planck"s theory. (photon) -- (section 38-2) E(each photon) = hf = hc/(cid:540), h = 6. 626x10-34 j. s.
