Unit E - Section 3/4 Practice Test

What does the Doppler Effect allow astronomers to determine?

• The temperature of stars

• The size of planets

• The rotation speed of black holes

• The motion of stars relative to Earth

When a star’s light is blue-shifted, it means the star is:

• Not moving

• Moving toward Earth

• Moving away from earth

• Exploding

Parallax is used to:

• Measure star temperature

• Measure distances to nearby stars

• Identify black holes

• Locate galaxies

Parallax works because of:

• Earth's movement around the sun

• Star brightness changes

• Reflection of light

• The Doppler Effect

What is the main difference between reflecting and refracting telescopes?

• Reflecting uses prisms; refracting uses mirrors

• Reflecting uses lenses; refracting uses mirrors

• Reflecting uses mirrors; refracting uses lenses

• Refracting uses satellites

Reflecting telescopes gather light using:

• Concave mirrors

• Convex lenses

• Fiber optics

• Satellite dishes

An advantage of reflecting telescopes is

• They are smaller

• They use multiple lenses

• They are unaffected by weather

• They can be built very large

What material is primarily used to focus light in a refracting telescope?

• Metal mirrors

• Glass lenses

• Radio dishes

• Plastic prisms

Refracting telescopes are limited because:

• Mirrors don’t reflect all light

• Large lenses can bend under their own weight

• They can't zoom in

• They overheat easily

Which of the following is true about constellations?

• They are groups of planets

• They are distant galaxies

• They orbit earth

• They are star patterns as seen from Earth