Question

student performs an experiment where he sends sound waves from the air through a solid, a liquid, and a gas. He records the speed of the wave traveling through each medium but forgets to label each medium. The table shows his observations.


Medium Speed Before (m/s)
X 972
Y 1,483
Z 5,940

The student knows that sound travels through room temperature air at 343 m/s. Based on the student's results, which medium is the solid, the liquid, and the gas?

a
X is the liquid, Y is the gas, and Z is the solid
b
X is the solid, Y is the liquid, and Z is the gas
c
X is the gas, Y is the solid, and Z is the liquid
d
X is the gas, Y is the liquid, and Z is the solid
Question 2 (1 point)
When a light wave enters a medium of greater density, which of the characteristics below will decrease in the wave.

a
Amplitude
b
Speed
c
Frequency
d
Height
Question 3 (1 point)
The picture shows Marco listening to music from a speaker in an adjoining room.



Why can Marco hear the music, even though he is not in the same room as the speaker?

a
The sound is being refracted around the corners of the doorway.
b
The sound is being diffracted around the corners of the doorway.
c
The sound is being reflected around the corners of the doorway.
d
The sound is being absorbed around the corners of the doorway.
Question 4 (1 point)
A diagram of a wave is shown below.



What is the amplitude of the wave?



a
10 cm
b
50 cm
c
20 cm
d
6 cm
Question 5 (1 point)
The diagram shows the identification of two types of waves.



Which question, represented by X on the diagram, helps to identify the type of wave?

a
Do the particles travel perpendicular to the wave?
b
Does the wave have an amplitude?
c
Do the particles transfer energy?
d
Does the wave require a medium to travel?
Question 6 (1 point)
How are wavelength and frequency related?

a
If the distance between the crests of the waves increase, the frequency decreases.
b
If the speed between the crests of the waves increases, the frequency increases.
c
If the speed between the crests of the waves decreases, the frequency increases.
d
If the distance between the crests of the waves decrease, the frequency decreases.
Question 7 (1 point)
1a862de7-5222-4ed5-bcba-8b8c836d45d7

The wavelength of the wave in the above diagram is:

a
Cannot be determined from graph.
b
3 m
c
2 m
d
6 m
Question 8 (1 point)
Ms. Knuth places a stick in a pond. When she looked down at the stick, it appeared to be broken or bent at the point where the stick entered the water. This was caused by:

a
Reflection of light waves passing from air into water.
b
A refraction of light from the water.
c
Refraction of light waves passing from air into water.
d
Diffraction of light waves around the stick.
Question 9 (1 point)
The picture shows a longitudinal wave.



Which picture best represents the wave if the amplitude is increased and the frequency is decreased?



a
A
b
B
c
C
d
D
Question 10 (1 point)
Which wave would have the lowest energy?



A



B



C


a
C
b
B
c
the all have the same energy
d
A
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Answer 1

Here are the answers with brief reasons:

1) d — X is the gas, Y is the liquid, Z is the solid.
- Y ≈ 1483 m/s (water/liquid), Z ≈ 5940 m/s (typical solid), X is the remaining gas.

2) b — Speed.
- When light enters a denser medium its speed (and wavelength) decreases; frequency stays the same.

3) b — The sound is being diffracted around the corners of the doorway.
- Diffraction allows waves to bend around obstacles/openings.

4) a — 10 cm.
- Amplitude = distance from equilibrium to crest (half the crest-to-trough height).

5) a — Do the particles travel perpendicular to the wave?
- That question distinguishes transverse (perpendicular particle motion) from longitudinal waves.

6) a — If the distance between the crests of the waves increase, the frequency decreases.
- Wavelength and frequency are inversely related for a given wave speed.

7) c — 2 m.
- (Typical diagram shows three full waves in 6 m → wavelength = 6/3 = 2 m.)

8) c — Refraction of light waves passing from air into water.
- Light changes direction when passing between media of different density.

9) c — C.
- Increasing amplitude and decreasing frequency → compressions are stronger (larger amplitude) and farther apart (longer wavelength / lower frequency).

10) a — C.
- The wave with the smallest amplitude and lowest frequency has the least energy.