You would like to observe an E. coli bacterium that is 1.95 mu m long. Because d

Question

You would like to observe an E. coli bacterium that is 1.95 mu m long. Because diffraction blurs an image, you would like to minimize the effects of diffraction by using a wavelength no larger than the object you are observing. For this problem, assume the wavelength is equal to the length of the bacterium. What is the energy of a photon with this wavelength? What is the energy of an electron with a de Broglie wavelength of this size? In terms of energy, which particles, photons or electrons, are the least likely to damage your sensitive biological sample?

Explanation / Answer

Neeet force on charge A

= k*q1*q2/r1^2 + k*q1*q3/r2^2

= -(9*10^9*1*10^-9*2*10^-9/0.03^2) + (9*10^9*1*10^-9*2*10^-9/0.02^2)

= 2.5*10^-5 N

magnitude of the net electric force on charge A = 2.5*10^-5 N

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