Mod 5 Lesson 1 Flashcards
Electromagnetic radiation:
Electromagnetic radiation: energy that travels in waves from a single source and includes all of the types of energy on the electromagnetic spectrum
Electromagnetic spectrum:
Electromagnetic spectrum: the collection of all known frequencies and wavelengths of electromagnetic radiation
Frequency
Frequency: the number of waves that pass a given point in a given amount of time, usually one second
Radiation
Radiation: method of heat transfer in which waves travel outward from a central source
Visible light
Visible light: a form of electromagnetic radiation that is visible to the human eye and is made up of all of the colors of the rainbow
Wavelength:
Wavelength: the distance from one point on a wave to the same point on the next wave
The longer the wavelength, the lower the total energy of the wave.
True or False?
True
The faster the frequency, the lower the total amount of energy of the wave.
True or False?
False
Shorter Wavelength + Higher Frequency = Higher Energy
True or False?
True
Longer Wavelength + Lower Frequency = _____ Energy
Lower or higher?
Lower
The _______________ spectrum that includes the seven types of __________ energy (radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma waves.)
Electromagnetic, Electromagnetic
Radio waves
Radio waves are used for communication applications in television, radar, and mobile phones. They have the longest wavelength and the lowest energy.
Microwaves
Microwaves are used for satellite signals and cooking.
Infrared waves
Infrared waves are used for remote controls, toasters, and night vision cameras.
Visible light
Visible light is the only part of the electromagnetic spectrum that humans can see with their naked eye. These waves allow us to see color.
Ultraviolet waves
Ultraviolet waves, also called UV rays, are the waves that cause your skin to burn when you spend too much time in the sunlight. UV light waves are also used to sterilize and disinfect items as they are good at destroying bacteria, viruses, and mold.
X-rays
X-rays are used in the medical profession to determine broken bones or to see the structure of your teeth.
Gamma rays
Gamma rays can be used to treat some forms of cancer. They may also be found in nuclear power plants. These waves have the shortest wavelength and the highest energy.
Which electromagnetic wave has the longest wavelength?
Radio wave
Which electromagnetic wave has the shortest wavelength?
Gamma wave
What wave property increases as the wavelength decreases?
As the wavelength decreases, frequency increases.
What happens to the energy as the wavelength decreases?
As the wavelength decreases, the energy increases.
What is visible light?
Visible light is a form of electromagnetic radiation. It is the part of the electromagnetic spectrum that is visible to humans and can be separated into the colors of the rainbow.
What do you get when you combine all the colors of light?
When all the colors of light from the spectrum are combined, you will get white light or sunlight.
