Quiz Electromagnetic Spectrum and Instruments

Four students create a table of information about cell phone technology. Which student's information should be corrected?

• Student 1; cell phones work using digital signals.

• Student 2; radio waves need mediums to transmit data

• Student 3; cell phones send and receive signals via satellites only.

• student 4; radio waves transfer large amounts of data that can be stored.

Different types of waves on the electromagnetic spectrum have differnt applications. Which statement is correct?

• The human body radiates infrared waves.

• Sunburn on human skin is a result of microwaves.

• Information is commonly transmitted with gamma waves.

• Images of bones for medical treatment are taken with ultraviolet waves.

The image shows wireless communication between a laptop and a local area network of computers connected by cables. A student claims that signals transmitted by wireless compter networks are more beneficial than signals transmitted by other devices. Which statement supports the student's claim?

• The wireless computer networks transmit signals that human beings can sense.

• Signals do not need digitalization for long-distance transmission.

• The wireless signals can carry large amounts of data at high radio frequencies.

• Signals are transmitted at lower radio frequencies to reduce loss of data.

Signals are digitized during Transmissions over wireless networks. The chart lists possible features of digital communication. Which features are correct?

• 1 and 2 only

• 3 and 4 onlly

• 1, 2, and 3

• 2, 3 and 4

A student reads and summarizes information about televisions, as shown. Which statement is true about today's televisions?

• Televisions operate best through the internet.

• Televisions are the most cost-effective modes of communication.

• Televisions work through satellite Communications only.

• Televisions are digital signals that make the transfer of data more efficient.

Radio signals that are detected by wireless computer networks are not detected by radios and televisions. How is this possible?

• The waves are easily reflected by atmospheric layers.

• The waves carry very little information.

• The waves have lower frequencies than radios and televisions are designed to detect.

• The waves have higher frequencies than radios and televisions are designed to detect.

Radios, televisions, cell phones, and wireless computer networks are examples of technologies that benefit humans. How are they beneficial?

• They transmit and receive signals with zero percentage loss.

• Use signals that do not require mediums to travel.

• A relay information without direct human interactions.

• They use low energy radio signals.

Why is the use of high frequency radio waves a beneficial technological advancement for humans?

• They have the best penetration.

• They carry more information.

• They travel over long distances.

• They do not require mediums to transmit.

Signals are digitized during Transmissions over wireless networks. The chart lists possible features of digital communication. Which features are correct?

• 1 and 2

• 2 and 3

• 2, 3 and 4

• 2 and 4

The use of high frequency radio waves is a beneficial technological advancement for humans because they

• Have the best penetration.

• Carry More information.

• Travel over longer distances.

• Do not require mediums to transmit.