Meanings
The entire range of the electromagnetic wave frequencies is known as _______
What is the electromagnetic spectrum?
Electromagnetic waves travel fastest in a ___________.
What is a vacuum?
Type of waves that do not require matter to carry energy?
What are electromagnetic waves?
Which of the following devices uses infrared waves?
1. cellular telephone
2. satellite
3. television remote control
4. radar
What is television remote control?
The standard unit of potential difference and electromotive force in the International System of units.
What is a Volt?
Materials that permit electrons to flow freely from particle to particle.
What are conductors?
This is a volume of space that is essentially empty of matter.
What is a vacuum?
As the frequency of an electromagnetic wave increases, the wavelength _______.
What is decreases?
In a vacuum, electromagnetic waves travel at what speed?
The speed of light.
These waves are used in night vision googles.
What is infrared?
These waves are used for Bluetooth, mobile communication, and audio transmissions.
What are radio waves?
The production of an electric current in a conductor by varying the magnetic field applied to the conductor.
What is induction?
The electric force per unit charge.
What is the electric field?
The energy of a photon _________ with increasing frequency of a wave.
What is increases?
Electromagnetic waves are created by _________ and ______________ .
What are vibrating/moving electric and magnetic fields?
These waves have the smallest wavelengths and the most energy of any wave in the electromagnetic spectrum
What are Gamma waves?
Though these waves are invisible to the human eye, some insects, like bumblebees, can see them!
ultraviolet waves
The flow of electric charge that reverses direction.
What is alternating current?
A circuit element used to increase the voltage of an alternating current.
What is a step-up transformer?
The electromagnetic spectrum starts with the lowest _________ and the longest wavelength.
What is lowest frequency?
An electromagnetic wave travels ___________ in air and ___________ in water.
What is air = faster
water = slower?
These waves can be used in communication, heating, and are considered a high-frequency radio wave.
What are microwaves?
The unidirectional flow of electric charge.
What is direct current?
A closed circuit where the current divides into two or more paths before recombining to complete the circuit.
What is a parallel circuit?
The basic unit of electrical current in the International System of Units.
What is the ampere?
equivalent to an amount of energy consumed per unit time.
What is power?
Gamma waves have the _________frequency and the _____________ wavelength.
What is highest frequency
shortest wavelength?
These waves are used in: airports, medical and dental clinics.
What are X-rays?
The relationship between frequency and wavelength.
What is inverse?
A material that prevent the free flow of electrons from atom to atom and molecule to molecule.
What is an insulator?
Waves that are used for communications and heating food
What are microwaves?
______________ ionize atoms, and are thus biologically hazardous, highest energy level.
What are gamma waves?
A tiny packet of light or energy.
What is a photon?
These reflected waves of these waves allow us to see our world
What is visible light?
A radio wave has the __________ wavelength and the _____________ frequency.
What is longest wavelength and
lowest frequency?
A closed circuit where the current follows only one path.
The standard unit of electrical resistance in the International System of Units
What is an ohm?
A light wave with a greater intensity also has a greater ______.
What is amplitude?
This happens to light as it enters a new medium at an angle.
What is changes speed and bends?
This uses coherent light, a narrow, focused beam, to emit a bright light at one wavelength.
What is a laser?
Heat transfer by electromagnetic wave.
What is radiation?
Visible light is seen as different colors because the brain sees them as different ________.
What are wavelengths?