The Big What?
The moment that the universe began to expand.
A police car driving past you, a wolf howling and running towards a person, a man playing a trumpet as he skis down a hill - these are all examples of what?
The Doppler Effect
Name the 7 types of electromagnetic radiation.
Radio, Microwave, Infrared, Visible, Ultraviolet, XRay, Gamma
What does CMB stand for?
Cosmic Microwave Background
What happens to light waves as they are redshifted?
They stretch out, wavelength increases.
How old is the universe?
About 13.6 billion years old.
The Doppler Effect is three things - name them!
1. Evidence for the Big Bang 2. A natural law of physics 3. A cool Halloween costume
Which color of visible light has the shortest wavelength?
Blue
What form of electromagnetic radiation was the CMB originally?
Heat and light
What happens to light waves as they are blueshifted?
They get closer together, wavelength decreases.
What is still happening to our universe today as a result of the Big Bang?
It is still expanding.
How does the frequency of the soundwaves change as the source of sound moves toward the observer?
Frequency increases, the sound sounds more high pitched.
As energy increases, frequency...
also increases.
Why did the light and heat of the Big Bang eventually become micorwaves?
The light waves stretched as the universe expanded.
Does redshift indicate that the source of light is moving away from the observer or toward the observer?
Away from the observer.
What was the universe like before the Big Bang?
very small, dense, and hot
What is wrong with this statement: The Doppler Effect is how noises become louder when they are closer to the observer.
The Doppler Effect is NOT about volume, only about frequency/ pitch.
As wavelength increases, frequency...
Decreases.
What temperature (in K) does the CMB have?
2.7K
Spectroscopy
Describe one theory for how the universe might end.
Big Rip (universe will tear apart)
Big Crunch (universe will contract again)
Big Freeze (universe will expand forever and completely run out of energy)
DUEL! All teams compete! Convince Mrs. Cerino that your team deserves these 500 points.
:)
What is a source of gamma waves on Earth?
Nuclear explosions.
Name the two scientists who first detected the CMB.
Arno Penzias and Robert Wilson (or Penzias and Wilson)
Why is redshift evidence for the Big Bang?
According to the Doppler Effect, waves stretch out as their source moves away from the observer. The light of distant galaxies is stretching out (redshifted). This means that everything in the universe is moving away from Earth and the universe is expanding. It has been expanding since the Big Bang.