Cosmology Quiz

What theory suggests that the universe was formed from an extremely hot and dense point and has been expanding ever since?

• Steady State Theory

• Pulsating Universe Theory

• Big Bang Theory

• Plasma Cosmology

According to cosmologists, what was the universe primarily made of shortly after the Big Bang?

• Rocks and dust

• Water and ice

• Hydrogen and helium

• Carbon and oxygen

What is the Doppler Effect an evidence of, according to the text?

• The creation of stars

• The expansion of the universe

• The formation of galaxies

• The cooling of the universe

What happens to the pitch of a siren according to the Doppler Effect when a police car is moving towards you?

• It remains constant

• It decreases

• It increases

• It fluctuates

How long after the Big Bang did it take for the first atoms to form?

• A few seconds

• A few minutes

• A few hundred thousand years

• A few million years

What happens to the pitch of a sound when the source of the sound moves away from the observer?

• The pitch increases

• The pitch decreases

• The pitch remains the same

• The pitch fluctuates

What is the relationship between the pitch of a sound and its wavelength?

• Higher pitch means shorter wavelength

• Higher pitch means longer wavelength

• Lower pitch means shorter wavelength

• Pitch and wavelength are unrelated

According to the Doppler effect, what can be inferred if the wavelengths of light from a star are becoming shorter?

• The star is moving away from Earth

• The star is moving toward Earth

• The star is stationary relative to Earth

• The star's light intensity is decreasing

What does the red shift in the light spectrum of distant galaxies suggest about their movement?

• They are moving toward Earth

• They are stationary relative to Earth

• They are moving away from Earth

• They are moving in a circular orbit around Earth

What does the Doppler effect reveal about the nature of light and sound?

• Both propagate in a vacuum

• Both are unaffected by the movement of their source

• Both are waves that can exhibit changes in wavelength due to motion of the source

• Both are particles that collide with each other