In an electron microscope, electrons are accelerated to great velocities. Calculate the wavelength of an electron traveling with a velocity of 7.0 * 10³ kilometers per second. The mass of an electron is 9.1 * 10^-28 g. A) 1.0 * 10^-13 m B) 1.0 * 10^-10 m C) 1.0 * 10^-7 m D) 1.0 m

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Quizplus · Accepted Answer

The wavelength of an electron with velocity v is given by λ = h/mv, where h is the Planck constant and m is the mass of the electron. Plugging in the given values, λ = h/mv = (6.626 x 10^-34 J s)/(9.1 x 10^-28 kg)(7.0 x 10^6 m/s) = 1.01 x 10^-10 m, which is choice B.

In an Electron Microscope, Electrons Are Accelerated to Great Velocities