S8P4 EOG review

If we compare and contrast electromagnetic waves with sound waves, all BUT one statement is true. That is

• sound waves require a medium to travel while electromagnetic waves do not.

• electromagnetic waves can travel through the vacuum of space while sound waves cannot.

• electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere.

• sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

Which of these are not mechanical waves and can be used to send a signals to satellites orbiting the earth?

• sound waves

• radio waves

• both sound waves and radio waves

• neither sound waves or radio waves

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A note is played on a flute. Which of the parts of the wave would be affected by playing a higher pitch note and how?

• D, the frequency would get higher.

• C, the wavelength would get shorter.

• C and D, the amplitude and wavelength would increase.

• A, B and D. The amplitude and crest would be higher, while the trough would be lower.

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As you tune your radio to a higher frequency, from 88.5 FM to 103.3 FM, the wavelength of the wave that you are tuning in

• 
  increases.

• decreases.

• remains the same.

• 
  randomly changes.

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It is recommended that children have no more than two sets of dental X-rays per year. Although X-rays have many benefits, they can be dangerous to human health because they are

Responses

• 
  generated by radioactive material.

• high amplitude, high energy waves.

• high frequency, high energy waves

• generated by high voltage machinery.

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Although you can see the pencil, it appears broken in the glass of water. This is because

• electromagnetic waves cannot travel through solids.

• electromagnetic waves travel at different speeds through different media.

• electromagnetic waves compress more when they travel through denser media.

• electromagnetic waves get closer together when they go through dense media like glass.

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If you put a pencil in a cup of water, it looks as if it is bent and larger in the water. This is because waves

• can reflect off the surface.

• are absorbed instead of reflected.

• bend around a barrier, like light does.

• change direction when they change mediums.

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In old western movies, cowboys often would put their ear to a train track to listen for an oncoming train. What benefit would this method 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 higher in frequency.

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Looking at the wave diagram, which best describes the wave?

• The period of the wave is decreasing.

• The energy of the wave is decreasing.

• The frequency of the wave is decreasing.

• The wavelength of the wave is decreasing.

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Eyeglasses bend light to help the image form properly on the retina. The bending of light as it passes from one medium to another is called

• diffraction

• interference

• reflection

• refraction

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