An electron in a piece of aluminum requires at least 6.73e-19 J of energy to be ejected from the aluminum. What wavelength of EM radiation does this correspond to? If instead the electron in Problem #6 is struck by EM radiation with a wavelength of 205 much kinetic energy will it have upon leaving the aluminum? nm, how What is the final speed of the electron in Problem #7?

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.