Waves and Digital Information

What is the role of a cell tower in communication?

• interpreter

• transmitter

• intermediary

• power supply

Tags

NGSS.MS-PS4-2

NGSS.MS-PS4-3

Which is the main advantage of digital signals over analog signals?

• Digital signals are easier to encode.

• Digital signals require less storage space.

• Digital signals are more immune to noise.

• Digital signals are more similar to the original information.

Tags

NGSS.MS-PS4-3

What does static on the radio refer to?

• amplitude

• frequency

• noise

• station

Tags

NGSS.MS-PS4-3

Students are using a spring to model waves being used to send signals. The student who senses that the wave pulse has arrived is acting as which component in the system?

• receiver

• transmitter

• image generator

• analog interpreter

Which is not an example of a code?

• a secret

• a memory from the past

• the sign language alphabet

• the information on a credit card

Which statement best shows an example of a wave being used to transmit a message?

• A motor boat travels down a lake.

• A lamp is turned on by plugging it in.

• A student writes a note on a piece of paper.

• A drummer uses a series of beats to start the band.

What is the main purpose of cellular towers?

• to decrease wave speed

• to increase wave frequency

• to decrease power consumption

• to increase transmission distance

Tags

NGSS.MS-PS4-2

Which of these is the basic difference between analog and digital signals?

• Analog signals can travel faster while digital signals can travel longer distances.

• Analog signals are relatively weak while digital signals have higher strength.

• Analog signals vary continuously while digital signals consist of discrete values.

• Analog signals are of relatively low frequencies while digital signals are of high frequencies.

Tags

NGSS.MS-PS4-3

Which of these is not an example of a wave being used for communication purposes?

• a wire carrying electrical current

• radio wave pulses in a wifi device

• a binary pattern used to make sound

• a fiber optic cable used to transmit light pulses

Tags

NGSS.MS-PS4-3

In which case are analog signals used as a substitute for digital signals?

• Receiver cannot be used.

• Electricity cannot be used.

• Interpreter cannot be used.

• Transmitter cannot be used.

Tags

NGSS.MS-PS4-3