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The resolving power of a microscope depends on the wavelength utilized. If one wished to "see" a particular type of molecule, a resolution of 1.2*10-10 m would be needed.
a) If electrons are used (in an electron microscope), what minimum kinetic energy is needed for the electrons?
_____________ keV
b) If photons are utilized, what minimum photon energy is required to obtain the required resolution?
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
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