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0coffeebean0

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## Homework Statement

An electron moving with a speed v can behave as wave with wavelength 6.4 x 10^-15 m. Given that the mass of electron = 9.1 x 10^-31 kg and the charge of electron is 1.6 x 10^-19 C, find

(a) the speed of v of the electron, and

(b) the voltage needed to accelerate the electron from rest until it acquires the speed v.

## Homework Equations

## The Attempt at a Solution

(a) wavelength = h / mv

v = h/ (m x wavelength)

= 1.1384 X 10^11 m/s

How do I calculate (b)? Please help, thank you. Kindly correct me if (a) is wrong.