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Physics

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Alexandrine Jones

Lvl 10
โˆ™ 2021-09-30 20:42:44
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Cards in this guide (21)
What causes refraction

changes in media

What is the term for the unit that measures wave frequency

The unit of frequency is "Hertz", abbreviated "Hz".

Also called "cycles". Also called "per second".

What causes overheating and fires associated with overloaded circuits

to much current

What is a transistor composed of

SILICON or common sand with doping of the right ratio to make a transistor.

three layers of semiconductor material

How can transistors act as amplifiers or switches

by creating two circuit loops

How are analog signals transmitted

Analog signals are transmitted as electrical waves.

Which of these is not a type of signal used to send information through electricity

transistor

What happens as a result of constructive interference

temporary increased wave amplitude

Which of the following best describes a wave

A disturbance that transfers energy.

Why are temporary magnets so useful

magnetic feilds are produced only when current is flowing

Which characteristic of a wave describes the greatest distance a wave vibrates from a resting position

amplitude

Which units are measurements of loudness

decibels
decibels

Which type of EM radiation is used to sterilize foods and medical instruments

gamma waves

Ultraviolet Radiation for A+ users
ultraviolet radiation
Answer #1:

Gamma radiation

======================

Answer #2:

That might be desirable, as it would kill them bugs dead in an instant.

Sadly, though, we don't have any method of generating, handling, or

controlling gamma rays easily, and they're dangerous to have around.

We do those tasks with plain old ultraviolet light.

Which of these waves would you expect to have the greatest wave speed

a wave with long wavelength and high frequency.

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.

Which of these statements about the EM spectrum is false

most of the EM spectrum is visible light.

Which of these is not a reason to avoid UV radiation

uv radiation destroys vitamin D

What is heat included in the equation of an endothermic reaction

The heat in an endothermic reaction is included as a reactant on the left side of the equation, and has a positive value.

which of the following is not an example of an electromagnetic wave

Beta waves aren't electromagnetic waves.

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