Unit 1 TEST Review - Size of Space, EM Spectrum, & Spectroscopy

Which of the following units is used to measure the distance to stars and galaxies?  

• Parsec

• Light-years

• Astronomical Units

• Kilometers

The Andromeda Galaxy is approximately 2.5 million light-years away from the Milky Way. What does this mean?  

• The light we see from the Andromeda Galaxy today left 2.5 million years ago.

• The Andromeda Galaxy is traveling at the speed of light.

• The Andromeda Galaxy is expanding away from us at 2.5 million miles per year.

• It will take a spaceship 2.5 million years to reach the Andromeda Galaxy.

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What is frequency a measure of?

• The length of the wave

• The height of the wave

• How many times a wave oscillates per second

• The speed of the wave

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Which color of visible light has the longest wavelength?  

• Blue

• Green

• Yellow

• Red

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Which of the following types of electromagnetic radiation has the longest wavelength?  

• Gamma Rays

• Infrared Radiation

• Ultraviolet Light

• Radio Waves

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As the frequency of an electromagnetic wave increases, what happens to its energy?  

• It decreases

• It increases

• It is not related to frequency

• It stays the same

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The EM spectrum is a continuous range of electromagnetic waves. What property distinguishes one type of wave from another?  

• Wavelength and frequency

• Velocity

• Color

• Amplitude

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Why are gamma rays considered the most dangerous type of EM radiation for humans?  

• They have the longest wavelength and lowest energy.

• They have the highest frequency and carry the most energy, allowing them to penetrate matter and damage living tissue.

• They are a type of sound wave that can cause internal vibrations.

• They are able to pass through the atmosphere and reach Earth's surface.

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Which of the following is true regarding the relationship between wavelength and frequency for electromagnetic waves?  

• Wavelength and frequency are not related.

• Wavelength and frequency are inversely proportional.

• Wavelength and frequency both increase or decrease together.

• Wavelength and frequency are directly proportional.

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What is the primary reason we use different types of telescopes to observe the EM spectrum?  

• Different wavelengths are absorbed by Earth's atmosphere, requiring specialized telescopes to observe them.

• Different parts of the spectrum can only be observed from specific locations on Earth.

• Different celestial objects emit only one specific type of radiation.

• Different types of telescopes are needed to see objects at different distances.

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