Digital v Analog
What type of signal changes smoothly and continuously over time?
Analog
Signals are sent as waves. Name one type of wave we have learned about.
microwave
radiowaves
xrays
infrared
gamma rays
ultraviolet
light
If a wave has a larger amplitude, what happens to its energy?
A. Energy decreases
B. Energy stays the same
C. Energy increases
D. Energy disappears
C
What allows us to see objects?
Light reflects off objects into our eyes
Which signal uses only two values, usually 0s and 1s?
Digital
What is the highest point of a wave called?
Crest
Which type of wave moves up and down while traveling forward?
transverse
Which part of the electromagnetic spectrum can humans see?
A. Infrared
B. Ultraviolet
C. Visible light
D. X-rays
C
Vinyl record player - Digital or Analog?
Analog
What is the lowest point of a wave called?
Trough
Which type of wave moves back and forth in the same direction the wave travels?
longitudinal
What happens when light hits a mirror and bounces back?
reflection
Which device commonly uses digital signals?
A. Smartphone
B. Record player
C. Tuning fork
D. Drum
A
What is the distance between two crests or two troughs in a wave?
wavelength
What are the compressed areas in a longitudinal wave called?
compressions
What is the main source of light for Earth?
Sun
What is the disruption called when you can't hear your music?
static
What is the height of a wave from the rest position to the crest called?
amplitude
What are the spread-out areas in a longitudinal wave called?
rarefactions
If an object appears green, what does that mean about the light it reflects and absorbs?
A. It absorbs green light and reflects all other colors
B. It reflects green light and absorbs the other colors
C. It reflects all colors of light
D. It absorbs all colors of light
B