Types of EM Waves
This wave has the longest wavelength and is the least dangerous.
Radio Waves
A telescope is pointed at a galaxy and detects that it is redshifted. Is the galaxy moving away or toward the telescope?
What is the Big Bang theory?
a. a hypothesis not supported by evidence that the universe was created in an explosion roughly 13.7 thousand years ago
b.a scientific theory that states all matter and energy in the universe today originated from a single point that was infinitely hot and infinitely dense an estimated 13.7 billion years ago
c. a theory that the known universe came about in only a few minutes when a series of stars were drawn through a black hole, triggering a nuclear explosion
B
Mr. Steel has a Bachelor's and a Master's degree. From which university did he earn his degrees?
Montana State University.
What is the only type of waves that humans can see?
Visible Light Waves
A telescope is pointed at a galaxy and detects that it is blueshifted. Is the galaxy moving away or toward the telescope?
Toward
The first line of evidence in support of the Big Bang has to do with the motion of distant galaxies. Why do more distant galaxies move faster than nearby ones?
a. the universe is contracting
b. the universe is static and unchanging
c. the universe is expanding
d. distant galaxies have more mass and momentum so they travel faster
C
Which High School did Mr. Steel graduate from?
Billings West High School
Visible Light Waves consist of all the colors of the rainbow. What are the colors in order?
Red, Orange, Yellow, Blue, Indigo, Violet.
True or False: Doppler effect only applies to sound waves.
False. It applies to all types of waves.
The second line of evidence in support of the Big Bang is the Cosmic Microwave Background (CMB). Why does the Big Bang predict CMB?
a. the very early universe gave off EM waves in the microwave, these waves have been bouncing around the cosmos ever since
b. microwaves travel faster than other EM waves and “pinball” off objects in space
c. microwaves travel farther than other EM waves because of their specific wavelength
d. the early universe had so much energy that it gave off visible light, after 13.8 billion years of traveling in the expanding universe this light has been stretched to longer wavelength microwaves
D
What college sport did Mr. Steel's wife do?
Cheerleading at MSU
What type of waves does the sun emit?
ALL WAVES
True or False: Hubbles law states that the galaxies closer to Earth are moving the fastest away.
False. Galaxies that are further away from Earth are moving the fastest.
The third line of evidence in support of the Big Bang is the composition of the universe. What is this evidence?
a. the vast majority of matter in the universe in the early Universe was hydrogen and helium (the simplest elements)
b. the majority of matter in the universe is still H and He
c. physicists’ calculations of the Big Bang accurately predict the percentages of H, He, Li, and other elements that we see in the universe
d. all of the above
D
How fast can Mr. Steel run a mile?
a. Under 7 min
b. Under 6 min
c. Under 5 min
D. Over 7 min
C. (4:35)
Why does the sun appear orange to us?
a. The Sun only emits orange light
b. The Sun emits all light except orange
c. The other colors emitted by the sun are scattered by the atmosphere and the orange light is what hits our eyes
d. The Sun appears purple to our eyes.
C
An ambulance is coming TOWARD you. Does this mean that the waves are spread out or crunched together?
Crunched together.
How fast do all waves in the EM Spectrum travel?
The Speed of Light.
True or False: Mr. Steel has a twin.