Wavefunctions of EM Waves Practice Problems

An electromagnetic wave exhibits a magnetic field that can be described by the equation B_y = (2.00 nT) sin[(0.80×10⁶)x - ωt], where x indicates the position in meters, and t is the time in seconds. Determine the wavelength of the electromagnetic wave.

A pulsar emits strong radio waves. The electric component of these waves, measured in a vacuum, is given by E_y = (25.0V/m) cos[(3.15 × 10⁷)x - ωt], where x is the position in meters and t is the time in seconds. Determine the amplitude of the magnetic field in these radio waves.