Use of Waves in Technology

Multiple Choice

At what speed do electromagnetic waves transmit messages by modern communications technologies?

• The speed of light

• The speed of sound

• The speed of mechanical waves

Multiple Select

Which of the following statements describes an analog wave? (Check all that apply)

• The signal moves instantly between a limited number of values.

• The signal moves gradually among an infinite number of values.

• People hear sound waves coming from an orchestra.

• Data are stored on computers.

Multiple Select

Which of the following statements would be an advantage of storing data digitally? (Check all that apply)

• The quality of copies does not decrease as more copies are made.

• It is easy to copy a computer virus to a device.

• Other people can access data that you don't want them to see.

• The parts of devices that store data are stable.

Multiple Choice

In digital data, 1s and 0s are represented by __________ amplitudes or frequencies.

• Continuously varying

• High or low

Multiple Choice

Suppose you want to use Wi-Fi to watch a video on a computer. Which of the following would be the first step in how the video gets to you?

• The information is received by a Wi-Fi antenna in the computer.

• A demodulator translates radio waves into a digital signal that the computer can use to play the video.

• The information reaches a router and is converted to radio waves.

• The information in the video is sent in binary code through fiber-optic cables.

Multiple Choice

Which of the following technologies uses visible light waves?

• Sonar

• Hand Lens

• Radar

Multiple Choice

Which of the following technologies uses sound waves?

• Sonar

• Hand Lens

• Radar

Multiple Choice

Which of the following technologies uses radio waves?

• Sonar

• Hand Lens

• Radar

Multiple Choice

The image shows a ship using sonar to locate a school of fish. Which data are used to determine the distance of the ship from the fish?

• The amount of time it takes the sound waves to travel to the fish and back to the boat

• The number of sound waves the ship emits

• The amount of time it takes the sound waves to travel from the boat to the fish

• The number of sound waves that bounce off the fish