Ch 24 TEST

What does a prism do?

• combines the many colors of visible light into white light by bending each wavelength at a different angle
• separates sunlight into ultraviolet and infrared radiation
• separates visible light into its many colors by bending each wavelength at a different angle
• changes the wavelength of electromagnetic radiation that passes through it

Which of the following types of visible light has the longest wavelength?

• red
• green
• violet
• blue

A star’s spectrum can tell astronomers

• how big the star is.
• the star’s chemical composition.
• the age of the star.
• how far away the star is from Earth.

Which type of spectrum does the radiation from most stars produce?

• absorption spectrum
• emission spectrum
• discontinuous spectrum
• continuous spectrum

What does the use of the Doppler effect tell astronomers about a star?

• a star’s exact velocity as it moves in the galaxy
• the chemical composition of the star
• its diameter compared to that of the sun
• whether a star is moving toward or away from Earth

A typical incandescent light bulb produces a(n)

• absorption spectrum
• emission spectrum
• discontinuous spectrum
• continuous spectrum

What does a refracting telescope use to produce an image?

• a mirror
• a spectroscope
• a prism
• a lens

Why is chromatic aberration a problem for astronomers?

• It blocks stars from most telescopes.
• It weakens the images of stars
• It makes stars appear much larger than they are
• It makes images of stars appear sideways

What does a reflecting telescope use to produce an image?

• a mirror
• a spectroscope
• a prism
• a lens

What do radio telescopes use to gather and focus radio waves?

• a very large mirror
• a set of glass lenses
• a huge dish
• a tall rotating tower