The Behavior of Waves

What causes the echo you hear in a hallway when you shout?

• The sound waves are absorbed by the walls.

• The sound waves travel through air and reflect off surfaces back to your ears.

• The sound waves are diffracted through the windows.

• The sound waves are refracted through the air.

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What is the role of dolphins' clicks in locating objects?

• To create echoes that help determine where objects are.

• To absorb sound waves from objects.

• To increase the sound wave frequency.

• To communicate with other dolphins only.

How do light waves behave when they strike your face and reflect off a mirror?

• They are absorbed by the mirror and disappear.

• They pass through the mirror without changing direction.

• They are refracted away from your eyes.

• They bounce off the mirror and reflect back to your eyes.

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What is the law of reflection?

• The angle of incidence is greater than the angle of reflection.

• The angle of incidence is less than the angle of reflection.

• The angle of incidence is equal to the angle of reflection.

• The angle of incidence is unrelated to the angle of reflection.

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According to the diagram, what is labeled as 'i' in the figure of the flashlight and the mirror?

• Reflected beam

• Normal

• Incident beam

• Angle of reflection

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What phenomenon explains why a pencil appears broken when placed in water?

• Reflection

• Diffraction

• Refraction

• Dispersion

What happens to light when it passes from a faster medium to a slower medium?

• It bends away from the normal.

• It travels in a straight line without bending.

• It bends toward the normal.

• It speeds up and exits the medium.

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What can change the speed of a wave?

• The color of the wave

• The intensity of the wave

• The medium through which the wave is moving

• The angle of incidence of the wave

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What happens to light waves when they move from air to water according to the diagram on refraction?

• They speed up and bend towards the normal.

• They slow down and bend towards the normal.

• They slow down and bend away from the normal.

• They speed up and bend away from the normal.

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What is demonstrated by the pencil in the glass of water example?

• Diffraction

• Dispersion

• Refraction

• Reflection

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