Homework Help: Chemistry

Posted by Garcia on Tuesday, November 13, 2012 at 9:55pm.

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 5.40 nm in diameter? Take the mass of an electron to be 9.11× 10–31 kg.

Chemistry - Garcia, Tuesday, November 13, 2012 at 9:57pm
I am having difficulty determining what would be the wavelength that I use to determine the velocity using de Broglie's equation.
Chemistry - DrBob222, Tuesday, November 13, 2012 at 11:54pm
I think you want to use
E = hc/wavelength and solve for E. Then KE = 1/2 m*v^2 and solve for v.
Chemistry - Garcia, Wednesday, November 14, 2012 at 12:04am
But what is the wavelenght? Do I use 5.40 nm?

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