To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. what kinetic energy must the electrons have in order to resolve a protein molecule that is 2.50 nm in diameter? take the mass of an electron to be 9.11× 10–31 kg.

In what direction does the medium move relative to the direction of the wave? explain.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?