Chapter 15
Facts about Infrared waves
Infrared waves are a type of electromagnetic wave with wavelengths between 1mm and 750 billionths of a meter. Infrared waves have shorter wavelength and greater frequencies than microwaves and radio waves.
What are Infrared Waves?
Infrared waves are the electromagnetic waves associated with heat.
What materials does light travel fastest in? Slowest in? In a vacuum?
Light travels through electromagnetic waves at the "speed of light" which is 300,000 km/s in the vacuum of space.
Difference between microwaves and radio waves
Microwaves have shorter wavelengths than radio waves and have a greater frequency as well.
What are the good effects and harmful effects of ultraviolet, UV, light?
Police detectives sometimes use fluorescent powder to show fingerprints when solving crimes. The shorter-wavelength UVB rays cause sunburn, and both UVA and UVB rays can cause skin cancers and skin damage such as wrinkling.
What are radio waves
Radio waves are low frequency electromagnetic waves with wavelengths longer than 1mm.
Fact about radio waves
Radio waves have the lowest frequency and longest wavelength of all electromagnetic waves. Microwaves have shorter wavelengths than radio waves and have a greater frequency as well.
How does a sound and water wave move?
Sound and water waves move through medium, without matter to transfer the energy, sound and water waves cannot move.
What are UV rays?
UV waves are electromagnetic waves with wavelengths from about 400 billionths to 10 billionths of a meter.
Electric and Magnetic fields
Vibrating fields exert forces on particles in the object and cause them to move and gain energy.
Wavelengths of a visible light
Visible light has wavelengths of 750 billionths to 400 billionths of a meter.
What is visible light?
Visible light is that range of electromagnetic waves that you can detect with your eyes.
How are waves produced and how do they carry energy?
Waves are produced by something that vibrates, and they carry energy from one place to another.
Wave
a repeating disturbance that transfers energy through matter or space
What is a mechanical wave?
a way that requires matter
What is a wave?
a way to transfer energy
How is a wave created?
add energy to medium or matter
What type of wave is a sound wave?
compressional longitude?
wavelength
distance between one point on a wave and the nearest point just like it
Crest
highest point of the wave
Frequency
how many wavelengths pass a fixed point each second
Trough
lowest point of a wave
What travels on a wave?
matter
Compressional
matter moves in same direction as wave travels
Amplitude
measure of the energy in a wave
transverse wave
medium moves at right angles to the direction the waves travel
How does sound travel through a medium?
ripple affect
compressional/longitude waves
the matter vibrations in the same direction as the waves travels
If the frequency of a given wave increases, what happens to the wavelength?
wavelength shortens
What are seismic waves?
waves caused by an earthquake
What causes ocean waves?
wind energy
What is the name given to a particle in an electromagnetic wave? What does the energy of a photon depend on?
A Photon, depends on the frequency of the waves. Increasing frequency will increase the energy of the photons.
Define Vibrating Electric Charge
A vibrating electric charge creates an electromagnetic wave that travels outward in all directions from the charge.
Radiant Energy
A wave that electromagnetic waves carry called radiant energy.
Is an electromagnetic wave a transverse or compressional wave?
An electromagnetic wave is a transverse wave.
Why is an electromagnetic wave considered to be a transverse wave?
Because the electric and magnetic fields at right angles to the direction the wave travels.
What produces an electromagnetic wave? Explain how this process works?
By vibrating electric charges.
How are electromagnetic waves made?
Electromagnetic waves are made by vibrating electric charges and can travel through space where matter is not present.
Photon
Electromagnetic waves can behave as a photon.
How fast can electromagnetic waves travel?
Electromagnetic waves travel at a speed of 300,000 km/s in the vacuum space.
How do electromagnetic waves travel?
Electromagnetic waves travel by transferring energy between vibrating electric and magnetic fields.
How do electromagnetic waves travel? Do they require a matter in order to transfer energy?
Electromagnetic waves travel by vibration. They don't require matter to travel.
How do electromagnetic waves transfer energy to your skin?
Electrons in your skin begin to vibrate.
Define Photon
Energy depends on the frequency of the waves. Increasing frequency will increase the energy of the photons.