EM waves and what materials do to them
EM waves and what materials do to them
Electromagnetic waves transfer energy and do not need particles to carry them, so they can travel through a vacuum. In a vacuum, all electromagnetic waves travel at about 3.0×108 m/s3.0 \times 10^{8} \, \text{m/s}3.0×108m/s, but in a material their speed can be different.