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For a Nb atom,the number of protons,neutrons,and electrons in the atom is
Q3: In a double slit experiment,if the separation
Q4: Which one of the following is an
Q6: A single slit forms a diffraction pattern,with
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Q12: A molecule of roughly spherical shape has
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Q23: The moment of inertia of a fluorine
Q49: An optical system comprises in turn,from left
Q52: You need 14 W of infrared laser
Q57: In the figure,the radius of curvature of