The graph shows how the displacement of an electromagnetic wave at one point varies with time. The wave is moving through a vacuum. What are the amplitude and the wavelength of the wave?
- Aamplitude $= 3.0$ (arbitrary units), wavelength $= 6000\,\text{m}$
- Bamplitude $= 6.0$ (arbitrary units), wavelength $= 6000\,\text{m}$
- Camplitude $= 3.0$ (arbitrary units), wavelength $= 7500\,\text{m}$
- Damplitude $= 6.0$ (arbitrary units), wavelength $= 7500\,\text{m}$