9 Weeks Exam Science

what unit is frequency measured in

• joules

• newton

• amplitude

• hertz

waves that move the medium parallel to the direction in which the waves travel are classified as which

• longitudinal

• crest

• transverse

• ocean

waves that move the particles of the medium across or at a right angle to the direction of the wave are known as which of the following terms

• longitudinal

• compression

• transverse

• rarefaction

what question could Eric ask to determine the difference between a sound or a light wave

• What are the waves carrying?

• How are the waves produced?

• In what direction does the wave travel?

• Do the waves need a medium to travel in?

Radio waves are transmitted to Earth from satellites; however, mechanical waves are unable to travel through space.

Which answer is the BEST explanation for how satellites work?

• Radio waves are electromagnetic waves, and electromagnetic waves can travel through a vacuum.

• Mechanical waves are electromagnetic waves, and electromagnetic waves can travel through a vacuum

• Radio waves are not electromagnetic waves, but radio waves can travel through a vacuum.

• Mechanical waves are not electromagnetic waves, but mechanical waves can travel through a vacuum.

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Which question would be the BEST to ask to determine if a wave is an EM wave or a mechanical wave?

• Does the wave contain energy?

• Does it require a medium to travel?

• Is it a longitudinal or transverse wave?

• Does the wave have a crest and trough?

Which of the following statements does NOT describe the characteristics of mechanical waves and electromagnetic waves?

• Electromagnetic waves are longitudinal waves and can travel through gases and vacuum.

• Sound waves are mechanical waves and need a medium to travel. They travel fastest through the solids and liquids and slowest through the gases.

• In a longitudinal wave, the compression is a region where the particles are closest together and rarefaction is a region where the particles are farthest apart.

• Transverse waves have crests and troughs. A trough is the highest point on the wave that the medium rises to while a crest is the lowest point on the wave that the medium can sink to.

Which correctly describes measuring the period in transverse and longitudinal waves?

• The period of a transverse wave is measured from the top of a crest to the top of the next crest, and the period of a longitudinal wave is measured from the beginning of one compression to the beginning of the next compression.

• The period of a transverse wave is measured from the top of a crest to the bottom of the next trough, and the period of a longitudinal wave is measured from the end of a compression to the beginning of the next rarefaction.

• The period of a longitudinal wave is measured from the top of a crest to the top of the next crest, and the period of a transverse wave is measured from the beginning of one compression to the beginning of the next compression.

• The period of a longitudinal wave is measured from the top of a crest to the bottom of the next trough, and the period of a transverse wave is measured from the end of a compression to the beginning of the next rarefaction.

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Horatio’s class is studying the electromagnetic spectrum.Which BEST explains the relationship between the electromagnetic spectrum, wavelength, and energy?

• Radio waves have the shortest wavelength and produce the least amount of energy in the electromagnetic spectrum.

• Visible light has the longest wavelength and produces the greatest amount of energy in the electromagnetic spectrum.

• Gamma waves have the shortest wavelength and produce the greatest amount of energy in the electromagnetic spectrum.

• X-Ray waves have the longest wavelength and produce the least amount of energy in the electromagnetic spectrum.

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Why must x-ray technicians take special precautions that radio technicians do not have to take?

• X-rays have much shorter wavelengths than radio waves, and are able to travel over and around more objects.

• X-rays have the same wavelengths as radio waves, but they are able to transport more energy.

• X-rays have much longer wavelengths than radio waves, allowing them to transport more energy.

• X-rays have much shorter wavelengths than radio waves, allowing them to transport more energy.

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