8. a vacuum tube can be used to

a. change alternating current into direct current

b. increase the strength of a signal

c. turn a current on or off

d. all of the above

9. a solid-state component with three layers of semiconductors is a

a. transistor

b. diode

c. vacuum tube

d. resistor

10. what is the primary use of transistors in a mobile phone?

a. store electric charge

b. maintain proper voltage

c. store data

d. amplify the phone's incoming signal

answers to electronic devices quiz

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prolly a beacuse the momentuem the car has increases while going down hill

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."