Understanding Light and Its Uses

Which of the following devices use light to send and receive information?

• Cell phones

• Wireless routers

• Car radios

• All of the above

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What do telescopes use to gather information from distant objects in space?

• Sound waves

• Electromagnetic radiation

• Water waves

• Mechanical waves

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Which types of light can telescopes view objects in?

• Ultraviolet, visible, and infrared

• Only visible

• Only infrared

• Only ultraviolet

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Which type of electromagnetic wave is used to pierce dense interstellar clouds?

• Gamma rays

• Radio waves

• X-rays

• Ultraviolet light

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What does the color of a star indicate?

• A) Its size

• B) Its age

• C) Its temperature

• D) Its distance from Earth

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What is the primary use of ultraviolet (UV) light in astronomy?

• To detect molecules in the atmospheres of planets

• To trace the hot glow of stellar nurseries

• To see through cold dust

• To identify supermassive black holes

What is spectroscopy?

• The study of sound waves

• The study of spectra produced when material interacts with or emits light

• The study of chemical reactions

• The study of gravitational forces

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Which element's spectrum is shown in the image with a pattern of colors including only purple and green?

• Carbon

• Oxygen

• Nitrogen

• Iron

What is the main difference between an absorption spectrum and an emission spectrum?

• Absorption spectrum shows bright lines, while emission spectrum shows dark lines.

• Absorption spectrum shows dark lines, while emission spectrum shows bright lines.

• Both show bright lines.

• Both show dark lines.

Which element's spectrum is shown in green in the diagram of the Southern Crab Nebula?

• Oxygen

• Hydrogen

• Nitrogen

• Sulfur