Electromagnetic Spectrum

What is essential for the existence of the modern world and our daily lives, yet is invisible?

• Gravity

• Electromagnetic radiation

• Air

• Sound

How do electromagnetic waves differ from ocean waves?

• They require water to travel

• They can only travel through air

• They can travel through the vacuum of space

• They have no frequency

What determines the frequency of an electromagnetic wave?

• The height of the wave

• The number of crests passing a point per second

• The speed of light

• The distance between crests

Which waves have the shortest wavelength and highest energy in the electromagnetic spectrum?

• Gamma rays

• Infrared waves

• Microwaves

• Radio waves

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What range of wavelengths can the human eye detect?

• 300 to 400 nanometers

• 700 to 1000 nanometers

• 100 to 200 nanometers

• 400 to 700 nanometers

Why do leaves appear green to the human eye?

• They emit green light

• They reflect green light

• They absorb green light

• They convert green light

What allows scientists to study phenomena beyond visible light?

• Microscopes

• Magnifying glasses

• Telescopes

• Spectral signatures

What is a spectral signature?

• A scientist's autograph

• A graph showing interactions across the electromagnetic spectrum

• A signature of a spectrum

• A type of light

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What did NASA's Spitzer Space Telescope discover in a galaxy 3.2 billion light-years away?

• Alien life

• A black hole

• Water and organic molecules

• A new planet

How do solar flares and eruptions affect Earth?

• They increase global temperatures

• They are harmless

• They can disrupt satellites and communications

• They cause earthquakes