Wireless Speaker

How does the total amount of information differ between an analog and a digital signal?

• a. A digital signal has more information because it has more values than an analog signal.

• b. A digital signal has more information because it has fewer values than an analog signal.

• c. An analog signal has more information because it has more values than a digital signal.

• d. An analog signal has more information because it has fewer values than a digital signal.

Tags

NGSS.MS-PS4-3

Why do most modern devices use digital signals?

• a. Digital signals contain more information than analog signals.

• b. Digital signals are more reliable over long distances than analog signals.

• c. Analog signals contain more information than digital signals.

• d. Analog signals are more reliable over long distances than digital signals.

Tags

NGSS.MS-PS4-3

A transmitter on the moon emits sound and light waves to a receiver on Earth. The light waves are picked up by the receiver but sound waves are not. This happens because _______.

• a. The atmosphere absorbs sound.

• b. Sound cannot travel through vacuum.

• c. Sound gets scattered before it reaches Earth.

• d. Sound takes a very long time to cover the distance.

Which part of the longitudinal wave shown above represents one wavelength?

• a. Part A

• b. Part B

• c. Part C

• d. Part D

The diagram above shows a triangular wave. Which lettered part represents the amplitude of the wave?

• a. Part A

• b. Part B

• c. Part C

• d. Part D

Tags

NGSS.MS-PS4-1

Plucking a guitar creates a wave whose motion is perpendicular to the downward force on the strings. The movement of the string is an example of a _________.

• a. Longitudinal wave

• b. Microwave

• c. Light wave

• d. Transverse wave

Select the phrase below that are characteristics of sound waves. (NOTE: select more than one answer.)

• a. Can cause objects to vibrate.

• b. Always travels at the same speed.

• c. Travels faster in solids than through air.

• d. Can travel through any type of matter.

• e. Always carries the same amount of energy.

Tags

NGSS.MS-PS4-2

Which material reflects the most light?

• a. Wax paper

• b. Aluminum foil

• c. Plastic wrap

• d. Brown paper

Tags

NGSS.MS-PS4-2

When a musician blows into a trumpet, a sound wave is formed that moves in the same direction as the musician's breath. This is an example of a

• a. Microwave

• b. Light wave

• c. Longitudinal wave

• d. Transverse wave

Which would create the highest frequency?

• a. 20 waves in 10 seconds

• b. 30 waves in 5 seconds

• c. 100 waves in 10 waves

• d. 5 waves in 5 seconds

Tags

NGSS.MS-PS4-1