Back to the Basics: Waves & Digital Communication

Which part of a wave is described as the highest point?

• Trough

• Crest

• Amplitude

• Wavelength

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In terms of energy transfer, how does a wave with a high amplitude differ from one with a low amplitude?

• A wave with higher amplitude carries less energy.

• A wave with higher amplitude carries more energy.

• Both waves carry the same amount of energy.

• Amplitude does not affect energy.

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If you press down on a piano key harder, how does the sound wave change?

• The sound wave's wavelength would increase.

• The sound wave's amplitude and energy would increase.

• The sound wave's frequency would increase.

• The sound wave's energy would decrease.

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Identify a disadvantage of using analog signals.

• Analog music is considered to be of lesser quality than digital music.

• Analog systems are less expensive than digital systems.

• Analog signals break down over time.

• Analog technology is no longer used in our modern society.

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Which is NOT a benefit of using digital signals to transmit information?

• Digital systems require complicated, expensive electronics.

• Digital signals do not break down over time.

• Digital signals can be recorded and stored easily.

• Digital signals can carry more information per second than analog signals.

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You observe two waves. Wave 1 has an amplitude of 3 meters and Wave 2 has an amplitude of 6 meters. How does the energy of Wave 2 compare to Wave 1?

• Wave 2 has half the energy of Wave 1

• Wave 2 has the same energy as Wave 1

• Wave 2 has twice the energy of Wave 1

• Wave 2 has four times the energy of Wave 1

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How could Simone measure the amplitude of ocean waves?

• Measure the vertical distance from the ocean floor to the crest of the wave.

• Measure the vertical distance from the water level to the crest of the wave.

• Record the number of wave pulses that pass a certain point in a certain amount of time.

• Measure the horizontal distance between two consecutive crests.

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Why might a recording studio prefer digital storage over analog?

• Sound information can only be stored using digital signals.

• Digital signals carry more information than analog signals.

• Stored digital signals can be more reliable than analog signals.

• Digital signals are less expensive to store.