17. The reason why viruses can be seen using electron microscope is that the wavelength of electron can be smaller than the size of viruses. Assume an electron microscope has an accelerating voltage of 40 kV. What is the wavelength of the electron?
(A) 0.006 nm
(B) 0.003 nm
(C) 0.06 nm
(D) 0.03 nm
(E) 0.6 nm.

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