WCAS Waves and Their Applications 2

Question 1

How do digital communication devices encode and transmit information using waves?

Accepted Answer

By encoding data as binary patterns in wave signals

Answer

Digital devices convert information into binary code (0s and 1s) which is encoded into wave signals for transmission.

Question 2

Which technologies use reflected wave signals to detect the distance and speed of distant objects?

Accepted Answer

Radar and sonar

Answer

Both radar (using radio waves) and sonar (using sound waves) calculate distance and speed by measuring the time it takes for reflected waves to return.

Question 3

In fiber optic communication cables, information is transmitted using:

Accepted Answer

Pulses of light waves

Answer

Fiber optic cables transmit information as pulses of light that travel through thin glass or plastic fibers by total internal reflection.

Question 4

Which part of the electromagnetic spectrum do cell phones primarily use to send and receive signals?

Accepted Answer

Radio waves and microwaves

Answer

Cell phones communicate using radio waves and microwaves, which can travel long distances and penetrate walls.

Question 5

Medical ultrasound imaging works by:

Accepted Answer

Sending high-frequency sound waves into the body and detecting echoes

Answer

Ultrasound devices emit sound waves above 20,000 Hz into body tissue and create images from the echoes reflected back from internal structures.

WCAS - Washington Comprehensive Assessment of Science Practice Test

WCAS - Washington Comprehensive Assessment of Science Practice Test

WCAS Waves and Their Applications 2