Three exact rows keep E=cB and wavelength-frequency speed consistent. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
The same magnetic field and frequency set a new speed row
Magnetic amplitude and frequency stay fixed. The checked wave row moves electric field and wavelength together so both speed ledgers agree.
E=cB=4m/s⋅2T=8V/mλf=2m⋅2Hz=4m/s
The same magnetic field and frequency set a new speed row
Magnetic amplitude and frequency stay fixed. The checked wave row moves electric field and wavelength together so both speed ledgers agree.
E=cB=6m/s⋅2T=12V/mλf=3m⋅2Hz=6m/s
The same magnetic field and frequency set a new speed row
Magnetic amplitude and frequency stay fixed. The checked wave row moves electric field and wavelength together so both speed ledgers agree.