Waves Unit Review

Which of the following best illustrates the concept of wave diffraction?

• The sound of music playing in one room can be heard in the adjacent room through an open door

• A prism separates white light into its component colors

• A mirror reflects sunlight into a dark room

• Radio waves are absorbed by the walls of a building

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2. All of the following are examples of electromagnetic energy except ________________

• radio signals sent through space
• x-rays showing an image of a person's broken bone
• a person receiving a call to his phone
• circles forming when a rock drops into a pond

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Which of the following electromagnetic waves has a higher frequency than visible light waves?

• radio

• infrared

• ultraviolet

• microwave

4. In old western movies, cowboys often put their ear to a train track to listen for an oncoming train. What benefit would this provide over listening for a train by listening for sound through the air?

• The sound would be louder
• The sound would be undistorted
• The sound would reach him sooner
• The sound would be higher in frequency

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5. What two factors are necessary for sound to be produced?

• reflection and amplitude
• refraction and frequency
• vibration and amplitude
• vibration and a vacuum

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Do gamma rays have a higher speed than visible light?

• No, they travel at the same speed

• Yes, they travel faster

White light can be dispersed into its component colors by using a ___________.

• prism

• lens

• mirror

• filter

8. Reflection is the bouncing of light rays off of a surface. Which situation is NOT an example of reflection.

• looking at yourself in a mirror
• focusing light through a camera lens
• seeing an image of yourself in a still lake
• looking at your teacher at the front of the class

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NGSS.MS-PS4-2

9. When you see a mirror image of yourself in the water of a lake, what causes this mirror image.

• black light
• refracted light
• reflected light
• transmitted light

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10. Why does light refract when it encounters the glass on a lens?

• because it speeds up, which causes it to bend
• because it slows down, which causes it to bend
• because it hits a dense medium, which causes it to bounce off
• because it gets absorbed, which causes it to lessen in intensity

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NGSS.MS-PS4-2