Unit 3 Review

Radar works like an echo. It shoots electromagnetic energy out and when it hits an object, the wave is reflected back. What would be an effective way to prevent the echo from happening?

• Paint the object with reflective paint.

• Paint the object with paint that absorbs that wavelength.

• A more rounded object will prevent detection.

• If the object is fast enough it will not be detected.

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NGSS.MS-PS4-2

Scientists debate theories and compare them with current observations to explain electromagnetic energy.

• False, one scientist will propose a theory.

• True, this is how we learn about the world around us.

• True, scientist are always debating.

• False, scientists debate theories.

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Explain what is happening in this image.

• Red and blue light is being reflected as green.

• The leaf is pointing at the eye.

• The green light is being reflected while the other colors are being absorbed.

• White light is being reflected after it transforms to green light.

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NGSS.MS-PS4-2

In this image the lines are light interacting with matter. What is happening to the light waves?

• They are being reflected.

• They are being refracted.

• They are being absorbed.

• They are being transferred.

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What part of the Electromagnetic spectrum has the longest wavelength?

• Gamma waves

• Radio waves

• Visible light

• Red light

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What part of the Electromagnetic spectrum has the shortest frequency?

• Gamma waves

• Radio waves

• Visible light

• Red light

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Complete this sentence stem with one of the choices below. Light waves travel the fastest...

• on Mars because it's so hot.

• in space because it is a vacuum.

• through a solid because the light is absorbed.

• in a liquid because it is a conductor.

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NGSS.MS-PS4-2

The data collected shows how sound waves travel through various materials. Which of the following statements best explains the data.

• The speed of sound travels fastest in liquid.

• The speed of sound is dependent on temperature.

• The speed of sound travels fastest in solids.

• The speed of sound travels fastest through air.

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NGSS.MS-PS4-2

Which statement below is true about waves?

• Longitudinal waves move in a parallel direction from where they start. The wave reflects back and forth between the two points.

• Transverse waves are slower than longitudinal waves.

• Longitudinal waves are faster than transverse waves.

• Transverse wave energy Is concentrated at the end of the wavelength peak.

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