Digital vs. Analog Signals
This type of signal has more total information because it has more values.
What is an analog signal?
A transmitter on the moon sends sound and light. Light reaches Earth, but sound doesn’t because of this.
What is “sound cannot travel through a vacuum”?
Plucking a guitar string creates a wave that moves perpendicular to the force.
What is a transverse wave?
The highest point of a transverse wave is called this.
What is a crest?
These two characteristics describe sound waves.
What are: “Can cause objects to vibrate” AND “Travels faster in solids than air”?
Modern devices prefer this type of signal because it stays clear and accurate over long distances.
What is a digital signal?
This happens when a white light shines on a black shirt.
What is absorption?
Blowing into a trumpet makes a wave that moves in the same direction as the air flow.
What is a longitudinal wave?
The lowest point of a transverse wave is called this.
What is a trough?
Sound waves can travel through these.
What is any type of matter (solids, liquids, gases)?
Which Signal is more reliable?
Digital signal
A shoe in the sun barely heats up because light does this to it.
What is reflect?
If the wavelength increases but the wave speed stays the same, this happens to the frequency.
What is it decreases?
This is the distance between two corresponding points on a wave (like crest to crest).
What is wavelength?
This is the sound characteristic related to frequency.
What is pitch?
How does the total amount of information differ between an analog and a digital signal?
An analog signal has more information because it has more values than a digital signal.
A dark towel gets hot in the sun because light energy does this.
What is absorbed?
This property of a wave measures how many waves pass a point per second.
What is frequency?
This is the height of a wave from the rest position to the crest or trough.
What is amplitude?
Sound waves travel fastest through this type of medium.
solid
Why do most modern devices use digital signals?
Digital signals are more reliable over long distances than analog signals.
Which material reflects the most light?
Aluminum foil
The dense, crowded area of a longitudinal wave is called this.
What is a compression?
The greater the amplitude, the greater this property of a sound wave.
What is volume (or loudness)?
Sound waves travel slowest through this type of medium.
What is a gas (like air)?