Do waves travel through empty space? - What if there is no medium to move in?
- Can any waves travel through empty space?
- If so, which ones?
- Light is a type of radiation; it is a type of wave that travels through space.
- Light waves are fundamentally different from many other waves that travel only through material media (sound or water waves).
- Light waves require NO material medium to travel from place to place.
- The wave speed of all types of light in a vacuum is called the speed of light, c. c = 300,000 km/sec
Terminology - Radiation:
- a way to transfer of energy in the form of a wave
- Light:
- Electromagnetic (EM) radiation:
- Also known as light, transfers energy and information from one place to another (in form of coupled electric and magnetic waves)
- Visible light:
Group Question - Determine the wavelength of your group’s favorite radio station.
- Assume you are 100 km (~60 miles) from the station transmitter. Calculate how long it takes for the radio waves to arrive at your location from the radio station transmitter.
- Wave speed = frequency x wavelength
- Speed of light (radio waves) = c = 3x 108m/sec
- Distance = speed x time
- x103 Hz (AM radio frequencies)
- x106 Hz (FM radio frequencies)
- All matter is made up of atoms.
- Atoms are, in turn, made up of smaller particles: protons, electrons, and neutrons.
- Two of the elementary particles that make up atoms possess a property described as electrical charge.
- The charges on each are equal and opposite.
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