Discuss each question with your team. Be prepared to explain the reasoning behind your team's answers after the quiz.

1. Which of the following can affect the apparent wavelength of light?
   • The velocity of the source
   • The velocity of the observer
   • The medium the light travels through
   • Gravity
   • All of the above
2. As an object moves towards an observer, _________
   • the wavelength of the light will increase and the frequency will decrease.
   • the wavelength of the light will decrease and the frequency will increase.
   • the wavelength and frequency will both increase.
   • the wavelength and frequency will both decrease.
   • the wavelength and frequency will stay the same.
3. The phenomenon described above is known as _________
   • the Black Drop effect.
   • the Yarkovsky effect.
   • the Doppler effect.
   • the Greenhouse effect.
   • the Holtzman effect.
4. Observations of the cosmos suggest that the Universe is _________
   • static.
   • collapsing.
   • expanding at a constant rate. 
   • expanding at an increasing rate. 
   • banana-shaped. 
5. The estimated age of the Universe is _________
   • less than 10 thousand years.
   • between 10 thousand years and 10 million years.
   • between 10 million years and 100 million years.
   • between 100 million years and 10 billion years. 
   • between 10 billion years and 100 billion years. 
   • more than 100 billion years.