Digital and Analog Waves

Which best compares the reliability of analog signals and digital signals?

• Only analog signals are reliable

• Analog signals are more reliable than digital signals

• Digital signals are more reliable than analog signals

• Both types of signals are equally reliable

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NGSS.MS-PS4-3

For which type(s) of signals does noise alter the original information?

• analog only

• digital only

• both analog and digital

• neither analog nor digital

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NGSS.MS-PS4-3

An analog signal is one that changes continuously

• True

• False

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NGSS.MS-PS4-3

Analog encoding sends or stores information using quantities that

• can vary continuously.

• can only have specific values.

• are separated by consistent numbers.

• store waves’ crest and trough sizes in small steps.

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NGSS.MS-PS4-3

Digital encoding sends or stores information using quantities that

• can vary continuously.

• can only have specific values.

• have no numeric gaps between one another.

• create smooth curves inside a sound wave.

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NGSS.MS-PS4-3

Which of the following is an advantage of digital over analog?

• Digital controls allow you more control over exact movement and direction.

• Digital calculations give you more accurate measurements.

• Digital controls move objects in predictable, exact increments.

• Digital devices generate stronger, more precise signals and waves.

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NGSS.MS-PS4-3

AM and FM radio stations

• switch between analog and digital signals to broadcast sound waves.

• transmit sound using multiple frequency ranges, including radio waves, visible light, and ultraviolet light.

• change the amplitude or frequency of waves to encode sounds.

• convert broadcasts into binary code.

Why is the weak analog signal harder to hear?

• The weak signal’s sound and clarity decrease corresponding to its amplitude.

• Radios have trouble distinguishing between weak signals and random noise.

• Increased distance causes wavelengths and frequencies to change.

• Radios have trouble connecting with lower-energy waves.

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NGSS.MS-PS4-1

Binary digital signals differ from analog signals because

• their amplitude values stay the same no matter the distance.

• digital encoding smooths out radio waves from their original sound, improving sound quality.

• their radio waves can only have two amplitude values—large and small.

• All of the above

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NGSS.MS-PS4-3

Why are digital signals less likely to be affected by noise than analog signals?

• There are more sources of analog noise than digital noise.

• Digital waves have higher amplitudes, and thus overpower noise

• Non-binary noise can be easily filtered out by digital systems.

• Analog radios add noise to the signals they receive to improve sound quality.

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NGSS.MS-PS4-3