Unit 2 Practice Test

What is a THEORY?

• A well tested explanation

• The best explanation of a natural event

• Tested and supported with evidence

• All the above

The apparent change in wavelength for frequency of the energy emitted by a moving object is called?

• The Galileo Effect

• The Doppler Effect

• The Newton Effect

• The Hubble Effect

In the Geocentric model, the Earth is located…?

• At the Center

• Orbiting the Sun

• The Earth is not in this model

• After Jupiter

In the Heliocentric model, the Earth is located…?

• Orbiting the Sun

• After Uranus

• Before Mars

• At the Center

The universe we live in is still?

• Expanding

• Shrinking

• Shifting

• None of the above

Stars moving away from an observer appear __________, while stars moving towards an observer appear __________.

• Blue, Red

• Red, Red

• Red, Blue

• Blue, Blue

In the Doppler Effect if the sound is moving towards and observer…

• The wavelengths lengthen

• The wavelengths shorten

• The wavelengths do not change

• I don't know

Our Solar system revolves around…

• The sun

• The galactic center

• The universe

• None of the above

In the Nebular Theory the main focus was to determine…

• How stars travel through space

• The color of stars while traveling through space

• How star systems were formed

• The name of the different star systems

When using the Doppler Effect to determine how the galaxies are moving, scientist have found they are…

• Not moving

• Shrinking

• Expanding

• It is ever changing