Figure 38-22 shows an electron moving (u) opposite an electric field, (b) in the same direction as...

Figure 38-22 shows an electron moving (u) opposite an electric field, (b) in the same direction as an electric field, (c) in the same direction as a magnetic field, (d) perpendicular to a magnetic field. For each situation, is the de Broglie wavelength of the electron increasing, decreasing, or remaining the same?

Fig. 38-22