space
The time it takes a planet to rotate once
What is DAY
Earth takes 24 hours to rotate once on its axis
A straight line that models the path of light
What is RAY
In a ray diagram, straight lines or arrows are used to model how light interacts with objects.
A measure of the number of particles in a given area
What is DENSITY
A sound wave is made up of areas of lower density and higher density.
A large natural object that orbits a planet
What is MOON
Earth has one moon, Mars has two and Jupiter has at least 79.
A material through which energy travels through
What is MEDIUM
Sound waves need a medium to travel through, but light waves can travel through empty space.
A change of state from gas to solid
What is DEPOSITION
In winter, water vapor in the air can turn directly into solid ice crystals on car windows as the particles lose energy.
An imaginary line halfway between the North and South Poles
What is EQUATOR
The Equator divides the Earth into northern and southern hemispheres.
A particle of light
What is PHOTON
Photons are a key idea in the particle model of light.
The interaction of two waves
What is INTERFERENCE
Interference can cause the amplitudes of two waves to add together or cancel out.
A time of year with typical weather patterns and daylight hours
What is SEASON
The Earth's tilt and orbit around the Sun causes the seasons
A type of energy that travels in electromagnetic waves
What is LIGHT
Light energy allows us to see a person on a video call
An object that only transmits some types of light
What is FILTER
A red filter only transmits red light and absorbs the other colors in white light.
The time it takes a planet to orbit once around the Sun
What is YEAR
Earth takes 365.25 days to orbit the Sun
Energy given off by objects as waves or particles
What is RADIATION
Visible light and infrared are both types of radiation.
The full range of frequencies of electromagnetic waves
What is ELECTROMAGNETIC SPECTRUM
Visible light is just a small part of the electromagnetic spectrum.