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, E k , must the electrons have in order to resolve a protein molecule that is 7.40 nm in diameter? Take the mass of an electron to be 9.11 × 10 − 31 kg .

The  kinetic energy must the electrons have in order to resolve a protein molecule is E = 4.36 × J

Explanation:

Given data

× m

Mass of electron = 9.1 × kg

From de-broglie theory

Put all the values in above formula we get

v = 0.98 ×

Kinetic energy is given by

× J

E = 4.36 × J

Therefore the  kinetic energy must the electrons have in order to resolve a protein molecule is E = 4.36 × J

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