Category 1: Electromagnetic Spectrum
This type of radiation has the shortest wavelength and the highest energy.
What are gamma rays?
These are the three primary colors of light.
👉 What are red, green, and blue?
This term describes how many wave cycles pass a point in one second.
👉 What is frequency?
This shift in light from distant galaxies is key evidence the universe is expanding.
👉 What is redshift?
This phenomenon explains why a siren sounds higher as it approaches you.
👉 What is the Doppler Effect?
Visible light is found between these two types of radiation on the electromagnetic spectrum.
What are infrared and ultraviolet?
Mixing red and blue light produces this color.
👉 What is magenta?
This is the distance from one crest of a wave to the next crest.
👉 What is wavelength?
If a galaxy’s light is red-shifted, it is doing this relative to Earth.
👉 What is moving away?
This discovery helped confirm the Big Bang by detecting background radiation.
👉 What is cosmic microwave background radiation (Penzias and Wilson discovery)?
This is the correct order of radiation from highest to lowest frequency: UV, visible light, infrared, and this.
What are microwaves?
Mixing green and blue light produces this color.
👉 What is cyan?
When an electron drops to a lower energy level, this particle is emitted.
👉 What is a photon?
If a distant galaxy is more red-shifted than a closer one, this conclusion can be made.
👉 What is that distant galaxies are moving away faster?
Most of the universe is made of these two elements.
👉 What are hydrogen and helium?
This type of radiation has a slightly longer wavelength than visible light.
What is infrared?
When red, green, and blue light are combined at full intensity, this color is produced.
👉 What is white?
This happens to light from the Big Bang as the universe expands, turning it into microwaves.
👉 What is stretching to lower frequency?
This radiation is leftover energy from the early universe and supports the Big Bang Theory.
👉 What is cosmic microwave background radiation?
When light from a galaxy shifts toward the red end of the spectrum, it indicates this.
👉 What is that the galaxy is moving away?
This is the approximate wavelength range of visible light.
What is 400 to 700 nanometers?
Elements emit unique color spectra because of this.
👉 What are unique electron energy levels?
Electrons can only exist in specific energy levels, which explains this feature in emission spectra.
👉 What are spectral lines (or discrete lines)?
Scientists determine the composition of stars and galaxies using this method.
👉 What is spectral analysis?
When electrons jump between energy levels, this explains why elements emit specific colors.
👉 What is quantized energy levels?