What is an Electromagnetic Wave?: What is an Electromagnetic Wave?
Radio waves, television waves, and microwaves are all types of electromagnetic waves. They only differ from each other in wavelength. Wavelength is the distance between one wave crest to the next. Slide9: Waves in the electromagnetic spectrum vary in size from very short gamma-rays smaller than the size of the nucleus of an atom to very long radio waves the size of buildings. Move about Wavelengths…: Move about Wavelengths… One way we measure the energy of an electromagnetic wave is by measuring its frequency. Let’s do an activity to show how wavelength and frequency are related! Frequency refers to the number of waves a vibration creates during a period of time—like counting how frequently cars pass through an intersection. Wavelength and Frequency: Wavelength and Frequency In general, the higher the frequency, or number of waves, the greater the energy of the radiation. In other words, the shorter the wave, the higher the energy. Electromagnetic Waves: Electromagnetic Waves Radio Tel
