Question

science matter and energy 2nd ed.
test 12 chapter 12
emma faith cleveland 861427
choose the best answer and fill in the bubble for the corresponding letter. use a number - two pencil only.

1. electricity can travel through a vacuum without a conductor because ______.

electrons are able to overcome air resistance without the aid of a conductor
electrons depend upon conductors for independent movement
it consists of individual electrons capable of movement independent of any medium
electrostatic attraction and repulsion will only take place within a vacuum

1. the production of an electric current in a vacuum using a heated cathode is called ______ emission.

thermionic
analog
thermodynamic
cathode

1. ______ is sometimes called the father of radio.

john ambrose fleming
wilhelm roentgen
thomas edison
lee de forest

1. the ______ can be used as a very fast electronic switch.

crookes tube
triode
diode
x - ray tube

1. doping is a process that is done to ______.

increase the conductivity of a semiconductor
increase the strength of a radio signal
knock electrons from their atoms to initiate an electric current in a conductor
study cathode rays within a vacuum tube

1. the most commonly used transistor today is the ______ transistor.

junction
point - contact
field - effect
n - p

1. the manufacture of integrated circuits starts with a rod of ______, which is sliced into thin wafers.

copper
germanium
phosphorus
silicon

1. which of these is not an advantage listed in the textbook of using integrated circuits instead of separate components?

they are cheaper to manufacture.
they cannot be damaged by static electricity.
they are much smaller.
they are more reliable.

1. the first general - purpose electronic computer was called ______.

analytical engine
eniac
ascii
univac i

1. which of the following statements regarding digital data is not true?

digital data can have any possible value within a specified range.
digital data is affected by noise less than analog data is.
digital data can be compressed to save storage space.
a receiver of a digital signal can detect when noise has destroyed the data.

Explanation:

1. Electricity consists of individual electrons capable of movement independent of any medium, so it can travel through a vacuum without a conductor.
2. Thermionic emission is the production of an electric current in a vacuum using a heated cathode.
3. Lee De Forest is sometimes called the Father of Radio.
4. A triode can be used as a very fast electronic switch.
5. Doping increases the conductivity of a semiconductor.
6. The most commonly used transistor today is the junction transistor.
7. The manufacture of integrated circuits starts with a rod of silicon, which is sliced into thin wafers.
8. Integrated circuits can be damaged by static electricity, so “They cannot be damaged by static electricity” is not an advantage.
9. The first general - purpose electronic computer was called ENIAC.
10. Digital data has discrete values, not any possible value within a specified range.

Answer:

1. It consists of individual electrons capable of movement independent of any medium.
2. Thermionic.
3. Lee De Forest.
4. Triode.
5. Increase the conductivity of a semiconductor.
6. Junction.
7. Silicon.
8. They cannot be damaged by static electricity.
9. ENIAC.
10. Digital data can have any possible value within a specified range.