Density of copper due to vacancy formation
The energy of formation of a vacancy in copper is 1eV. what is approximate relative change in the density of copper due to vacancy formation at a temperature just below its melting point (1356K)
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A 1.0-cm-diameter microscope objective has a focal length of 2.8 mm. It is used in visible light with a wavelength of 550 mm. A. What is the objective's resolving power if used in air?
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