(Savvas 17.3) Ch 17.3 Behavior of Waves

Is the following sentence true or false? Reflection occurs when a wave bounces off a surface that it cannot pass through.

• True

• False

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What happens when a wave reflects off a fixed boundary?

• The reflected wave will be turned upside down.

• The amplitude will double as it strikes the surface.

• The speed of the wave will decrease.

• The frequency of the wave will decrease.

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Refraction occurs when a wave enters a new medium at an angle because

• the wave changes speed in the new medium.

• the wave's frequency changes.

• the wave's amplitude increases.

• the wave is absorbed by the new medium.

Is the following sentence true or false? A wave diffracts more if its wavelength is small compared to the size of an opening or obstacle.

• True

• False

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What causes wave interference?

• Wave interference occurs when two or more waves overlap and combine.

• Wave interference occurs when a single wave travels in a straight line.

• Wave interference is caused by the bouncing of waves as they meet a surface that they cannot pass through.

• Wave interference happens when waves are absorbed by a medium.

At certain wavelengths, interference between a wave and its reflection can produce a(n) ______.

• standing wave.

• traveling wave.

• diffraction pattern.

• amplitude modulation.

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Which statement is true about standing waves? (Mark all that apply.)

• A node is a point that has maximum displacement from the rest position.

• Complete destructive interference occurs at nodes.

• A standing wave will form for any wavelength, as long as two ends of a rope or string are stretched tightly between two points.

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Is the following sentence true or false? If a standing wave occurs in a medium at a given wavelength, another standing wave will occur if this wavelength is doubled.

• True

• False

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Which one of these is an example of a common standing wave?

• The vibrations you can see when plucking a stringed instrument.

• The sound of a car engine running smoothly.

• The light from a flashlight.

• The flow of water in a river.

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Which of the following is an example of wave refraction?

• A straw appearing bent when placed in a glass of water.

• Water waves bending around a rock.

• An echo heard in a canyon.

• Light bouncing off a mirror.

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