Wireless Communications

Remote controls enable users to adjust the volume and channel of televisions without having to touch the television. Which of these best describes the signals sent by remote controls to televisions?

• potential energy

• sound waves

• electromagnetic waves

• gravitational energy

Tags

NGSS.MS-PS4-2

NGSS.MS-PS4-3

Which of the following best describes how wireless telephones are able to receive and produce sound from one person to another?

.

• Electromagnetic waves are received and then vibrate a speaker which produces sound waves.

• Sound waves are received and then vibrate a speaker which produces additional sound waves.

• Electromagnetic waves are received and then vibrate a speaker which produces additional electromagnetic waves.

• Sound waves are received and then vibrate a speaker which produces electromagnetic waves

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Scientists on Earth are able to communicate with rovers on Mars through their receivers, which can receive and process signals. Which of these best describes the signals sent and received by rovers?

• sound waves

• electromagnetic waves

• potential energy

• gravitational energy

Tags

NGSS.MS-PS4-3

A music studio records music using digital technology instead of analog technology. Why does the music studio likely use digital technology for recording rather than analog technology?

• Digital technology has been used longer than analog technology.

• Digital technology can store information more reliably than analog technology.

• Digital technology cannot be changed while analog technology can easily be modified.

• Digital technology produces more background noise in recordings than analog technology.

Tags

NGSS.MS-PS4-3

The Global Positioning System, or GPS, uses a network of satellites that orbit the Earth to calculate and track locations. Which of the following best describes the signals sent and received by satellites?

• electromagnetic waves

• gravitational energy

• sound waves

• potential energy

Tags

NGSS.MS-PS4-2

Why do people see distant events before they hear them?

• Light travels faster than sound.

• Sound travels faster than light.

• Human brains can only process events in that order.

• Human eyes are more sensitive than human ears.

The orca uses this behavior of waves to locate food.

• Refraction
• Reflection
• Absorption
• Transmission

Tags

NGSS.MS-PS4-2

What type of wave behavior is pictured above?

• Refraction
• Reflection
• Absorption
• Diffraction

Tags

NGSS.MS-PS4-2