If the Wave Function for a Free Electron Is Given

Multiple Choice

If the wave function for a free electron is given by Ψ = A sin kx + B cos kx, and the electron has a speed of 5.2 x 10⁶ m/s, what is the value for k?

A) 1.9 x 10^-7 m^-1 m^-1
B) 1.2 x 10^-6 m^-1
C) 7.2 x 10⁹ m^-1
D) 4.5 x 10¹⁰ m^-1
E) 3.8 x 10¹¹ m^-1