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An electron microscope focuses electrons through magnetic lenses toobserve objects at higher magnification than is possible with alight microscope. For any microscope, the smallest objectthat can be observed is one-half the wavelength of the radiation used. Thus, for example, the samllest object that can beobserved with light of 400 nm is 2 x 10-7 m.

(a) What isthe smallest object observable with a electron microscope usingelectrons moving at 5.5 x 104 m/s? (b) At 3.0 x107 m/s?

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