AnswersEA Academy Civics 9Creating a Personal Budget

Creating a Personal Budget — Unit test Answers

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21
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Sound Wave A is moving through a medium that is decreasing in temperature.Sound Wave B is moving from a liquid to a gas medium.

A
They will speed up.
B
They will increase the density of their medium.
C
They will slow down.
D
They will decrease the density of their medium.
22
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What do diffraction and refraction have in common?

A
They both involve interference.
B
They both involve wave interactions.
C
They both involve reflection.
D
They both involve construction.
23

Which equation should be used to calculate the speed of a wave?

A
speed = frequency x wavelength
B
speed = frequency x hertz
C
speed = period x wavelength
D
speed = period x hertz
24

What is occurring when two waves traveling along the same medium meet and cancel each other out?

A
destructive interference
B
constructive interference
C
reflection
D
refraction
25

Adam observed properties of four different waves and recorded observations about the frequency and volume of each one in his chart.

Question illustration
A
Only the sound quality of waves Y and Z can be compared.
B
The sound quality of all of the waves can be compared.
C
The sound quality of waves W and X can be compared.
D
The sound quality for these waves cannot be compared.
26

Review Jesse’s budget.Which budgeting choices can Jesse make to get a car sooner than originally planned? Choose five correct answers.

A
spend less and save more over the next year
B
set aside more money for the yearly spending allowance
C
save for a car that costs less money
D
work more hours at the store after school or on weekends
E
work all 52 weeks out of the year
F
work a few extra weeks at the farm
27

If humans cannot see ultraviolet waves, how can ultraviolet light be used to gather evidence of a crime?

A
Ultraviolet light detects the presence of radioactive substances.
B
Ultraviolet light shows cold areas as blue and warm areas as red.
C
Ultraviolet light causes substances to fluoresce and give off visible light.
D
Ultraviolet light transmits information to AM and FM radio receivers.
28

Which part of the electromagnetic spectrum is necessary for the sense of sight in humans?

A
radio waves
B
gamma rays
C
infrared light
D
visible light
29

Sound waves are produced when something is caused to

A
reflect.
B
vibrate.
C
slow down.
D
get warmer.
30

Four waves are produced when a harp is strummed at four different times.Which wave will produce the highest pitch?

Question illustration
A
Wave 1
B
Wave 2
C
Wave 3
D
Wave 4
31

On top a coiled spring labeled Wave A with coils, which are widely spaced then tightly spaced then widely space. On bottom a coiled spring labeled Wave B with coils, which are widely spaced then very tightly spaced then widely space.

Question illustration
A
Wave A has a lower amplitude than Wave B.
B
Wave A has a higher amplitude than Wave B.
C
Wave A has a lower frequency than Wave B.
D
Wave A has a higher frequency than Wave B.

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