Final answer:
To calculate the wavelength of an electron traveling at a given velocity, use the de Broglie wavelength equation.
Step-by-step explanation:
The wavelength of an electron can be calculated using the de Broglie wavelength equation:
λ = h / (m * v)
Where λ is the wavelength, h is Planck's constant (6.626 x 10^-34 Js), m is the mass of the electron (9.11 x 10^-31 kg), and v is the velocity of the electron (2.85 x 10^7 m/s).
Substituting the given values into the equation, we get:
λ = (6.626 x 10^-34 Js) / (9.11 x 10^-31 kg * 2.85 x 10^7 m/s)
Solving this equation gives us the wavelength of the electron.