Topic 5 (Big Bang Theory) Review

Select all that apply. Before the universe formed it was...

• Cool

• Hot

• Dense

• Spread out

The universe is made up of ________ helium.

• 75%

• 50%

• 23%

• 2%

The universe is made up of ________ hydrogen.

• 75%

• 50%

• 23%

• 2%

The universe is made up of ________ all other elements besides hydrogen and helium.

• 75%

• 50%

• 23%

• 2%

Select all that apply. As the universe expanded, it became...

• More dense

• Less dense

• Hotter

• Cooler

As the universe cooled down...

• Collisions became less frequent

• Collisions became less violent

• Lightweight elements began to form

• All of the above

As the universe expands, the distance between stars and galaxies...

• Increases

• Decreases

• Stays the same

According to inertia, if a ball is thrown and nothing interferes with its motion, it will...

• Fall to the ground

• Speed up

• Go in a straight line with constant speed

• Slow to a stop

Matter and energy were "thrown out" in all directions as the hot, dense singularity expanded. Why does the universe continue to expand today?

• The universe is gaining more and more matter over time

• Energy is constantly being added to the universe

• More elements are forming

• Inertia makes it so that matter continues to move outward

Which color of visible light has the longest wavelength?

• Red

• Yellow

• Green

• Blue