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☆☆☆☆☆Cards in this guide (15)
Which type of modification of radio waves sends signals the farthest
amplitude modulation
What kind of basic scientific knowledge is vital to the production of medicines
chemistry
Which technological device is used by most scientists in the world
computer
What kind of basic knowledge goes into the technology of automobiles
All the answers are correct.
Which material lines the tubes of fluorescent lights and glows when exposed to UV light
Phosphor.
Which term indicates the imaginary line that extends straight out from the center of a reflective surface
The imaginary line that extends straight out from the center of a reflective surface is the optical axis.
Which of the following is true of a real image
it can be projected
Which term is used to describe objects that are visible because of reflected light
illuminated
Thats the right answer for a plus.
What are the biggest machines in the world used for
Learning more about subatomic particles
Why do you use digital signals
to decide true or false
Which of the following is true of sound waves
sound waves require a medium to transfer energy
FOR A+ USERS THE ANSWER IS Sound waves travel in all directions
sound waves require a medium to transfer energy
-- They are longitudinal waves and material medium is required for their propagation.
What type of device is used to increase or decrease the voltage of an electric current
The device is called a "variac' and it is a type of transformer. It has a variable voltage ouput.
True or false radio waves are electromagnetic waves
true
Which type of technology predates most of our knowledge of basic science
electricity
What of these statements is true of technology
It can create new problems
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