Lessons 7 & 8 Waves TCI 21-22

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.

Tags

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.

Tags

NGSS.MS-PS4-3

Which of the following is NOT an analog device?

• a light knob that can adjust brightness between fully on and off

• a mouse connected to your computer controlling your cursor

• an FM radio tower broadcasting music

• a runner’s watch that can time to thousandth-second intervals

Tags

NGSS.MS-PS4-3

A signal is

• a radio wave with an unchanging amplitude and frequency.

• a radio wave with an unlimited range.

• a wave that can only be generated in analog.

• anything that carries information and can be detected.

Tags

NGSS.MS-PS4-3

Why is the weak analog signal harder to hear from a radio tower?

• 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.

Tags

NGSS.MS-PS4-2

Radio noise is:

• unwanted, random signals interfering with the intended signal.

• a natural result of waves decreasing in energy and amplitude over long distances.

• caused by radio receivers being unable to interpret waves with low amplitudes.

• intentionally added to radio waves.

Binary code:

• is made up of only two values, such as 1s and 0s.

• can be separately interpreted as text, sounds or images.

• signals when electrical switches in digital devices should activate.

• All of the above

Tags

NGSS.MS-PS4-3

How are text messages sent to another phone?

• Your phone relays a series of radio wave pulses.

• Your phone transmits a series of dots and dashes.

• Your phone encodes information into a single light wave.

• Your phone conveys physical matter through electric signals.

Tags

NGSS.MS-PS4-3

Light wave pulses:

• always have the same frequency.

• cannot travel over long distances.

• follow a repeating wave pattern.

• convert a device’s matter into wave form.

Tags

NGSS.MS-PS4-1

Which of these is an advantage of communication by moving matter? (Ex: handwritten letter)

• Matter moves much faster than wave do.

• Transporting matter expends less energy than wave transmission

• Messages sent by moving matter are more efficient during an emergency.

• Messages sent by moving matter convey your exact message without need for technology.