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WorksheetsLessons 7 & 8 Waves TCI 21-22
Total questions: 14
Worksheet time: 7mins
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.
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.
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
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.
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.
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
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.
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.
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.
When you speak into your cell phone, it translates the sound waves:
directly into visible light waves.
into infrared energy, then into radio waves.
into pulses of electricity, then into radio waves.
directly into infrared energy.
A phone’s radio waves cannot be detected more than 40 miles (approximately) unless they are:
converted into higher-energy wave pulses.
detected and intercepted by cell towers.
transmitted directly into fiber-optic cables.
None of the above (they can travel thousands of miles unassisted)
Underground fiber-optic cables carry ________ from one cell tower to another.
infrared waves
radio waves
sound waves
ultraviolet waves
Phone calls are NEVER converted into which of the following waves or forms?
Infrared waves
Visible waves
UV rays
Electricity
