Waves used in Tech Test Bank

Digital information can be sent through the vacuum of space, but the information must be–

• below a certain size
• converted to pulse waves
• encrypted for security reasons
• sent in only one direction

Photodiodes are semiconductor devices that transform light into an electrical current. Photodiodes are used in many electronics, including remote controls and compact disc players. This technology depends on which specific characteristic of light?

• Light waves can interact to create waves of greater or lesser amplitude.
• Light waves scatter when they reflect off a rough, uneven surface.
• Light can cause some materials to emit electrons when it strikes them.
• Light travels faster through a vacuum than it does through a medium.

What types of waves are used in ultrasounds?

• Sound
• Light
• Water
• Microwave
• Radio

Which of the following is NOT a drawback of using digital signals to send information

• Expensive to store information
• Low accuracy of signal
• Small signal size
• Less noise/ interference

You want to send an email- you have a choice of sending the email using digital or analog transmission methods. Which method will guarantee a higher degree of accuracy transmission

• Digital
• Analog
• Both methods have the same accuracy

Binary code is an example of...

• Digital data transmission
• Analaog data transmission
• Binary can be used in either format

A digital camera takes pictures by capturing information about the intensity and color of light for every tiny section of the image and then doing which of the following?

• Converting the information to numeric data
• Sending the information to a satellite
• Creating an exact duplicate of the image
• Storing the light in specialized cells

Ground penetrating radar uses radio waves to create images of various rock formations, including fossil fuels, deep underground. Radio waves are better than other electromagnetic waves for this purpose because longer wavelengths–

• carry greater amounts of energy.
• have the highest frequency.
• travel further into a solid medium.
• can be generated by nam-made devices.

Which of the following is best suited for viewing cracked ribs?

• Ultrasound
• MRI
• X-Ray
• CAT scan

Television broadcasts may be transmitted by-

• UV waves
• infrared waves
• microwaves
• radiowaves
• all of the above