Waves and Information

Which characteristic of a wave can be modified to carry information?

• speed

• energy

• medium

• amplitude

Tags

NGSS.MS-PS4-1

What is a strength of analog thermometers?

• They cannot measure temperatures below 0 °C.

• They cannot measure temperatures above 100 °C.

• They can measure changes in temperature at any value.

• They can measure a set number of values of temperature.

Where are binary digital signals most commonly used?

• computers

• smartphones

• digital thermometers

• measuring water poured into a cup

Tags

NGSS.MS-PS4-3

What property of an electromagnetic wave changes when the wave is encoded with analog information?

• speed

• amplitude

• frequency

• wavelength

Tags

NGSS.MS-PS4-3

Which of the following is true if noise is added to a signal?

• The signal becomes stronger than the original signal.

• The signal becomes weaker than the original signal.

• The signal becomes clearer than the original signal.

• The signal’s information is different from the original signal’s information

Tags

NGSS.MS-PS4-3

Why are digital signals better for information storage than analog signals?

• A digital signal uses only 1s and 0s.

• A digital signal is less affected by noise.

• A digital signal sends the information faster.

• A digital signal amplifies the stored information.

Tags

NGSS.MS-PS4-3

What is one reason digital signals are considered more reliable than analog?

• Digital signals can be used by more people.

• Digital signals can be designed to reduce noise.

• Digital signals can be coded and decoded easily.

• Digital signals can be carried over long distances.

Tags

NGSS.MS-PS4-3

When music is recorded, it is recorded as an analog wave. It is then stored on a computer as a digital signal. When a person wants to listen to the music, it needs to be converted back to an analog wave. What is one reason sound engineers store the music as digital files instead of analog?

• The digital files sound better.

• The digital files are easier to understand.

• The digital files can be decoded by a person.

• The digital files are less likely to lose information.

Tags

NGSS.MS-PS4-3

What is one advantage to using a computer instead of Morse code to send information?

• A computer uses digital signals.

• A computer can decode complex signals.

• A computer can send signals over long distances.

• A computer uses people to code and send signals.

Tags

NGSS.MS-PS4-3

An engineer is designing a device that sends and stores information. He decides using digital information is better than analog. What is one reason he would decide this?

• Digital signals have less noise.

• Digital signals are easier for people to understand.

• Digital signals do not change when they are stored.

• Digital signals do not need special equipment to be decoded

Tags

NGSS.MS-PS4-3