Waves Unit Test

1. Which of the following describes the diffraction of a wave?

• The sound of a person's shout moves out of the room and spreads into the hallway
• The lens of a magnifying glass makes an image look larger and upside down
• A wave of a sound is echoed in the wilderness
• Waves of electromagnetic energy pass right through skin and bones

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

3. Which of the following electromagnetic waves has a shorter wavelength 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

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

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

6. How do sound waves move in air?

• The wave particles diffract around a barrier
• The wave particles move in a curvilinear motion
• The wave particles move via acceleration; that is, they increase in speed
• The wave particles displace one another, the particles replacing each other.

7. A student looks at ocean waves coming into the beach. An ocean wave with more energy will ______

• have a greater height
• have a greater period
• travel towards the beach faster
• strike the beach with greater frequency

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

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

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