Title: Mid-Unit Assessment
Course: MNPCC Physics > Section: Mechanical Waves

Use this quiz to see how you are progressing towards understanding the unit's concepts.

Q: What is the amplitude of the wave depicted here?
- 3 (Correct.)
- 6 (That is twice the amplitude.)
- 8 (That is the wavelength.)
A: 3
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: How does the frequency of a wave when the source is moving towards the observer compare to the frequency of that source when it is stationary?
- The frequency is higher.
- The frequency is lower.
- The frequency remains the same.
A: The frequency is higher.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: A slinky wave goes from crest to trough and back to crest 50 times in 30 seconds.  What is the frequency of the wave in units of Hertz (1/s).
- 1.7 (Correct.)
- 0.6 (This is the period, not the frequency.)
- 30 (This is a time for 50.)
- 50 (That is how many waves go by in 30 seconds.)
A: 1.7
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: What type of interference arises when two waves are out of phase with each other?
- Destructive interference.
- Constructive interference.
- There will be no interference.
A: Destructive interference.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: What happens to the amplitude of a sound every time the loudness increases by 10 decibels?
- It gets 10 times bigger.
- It gets 2 times bigger.
- It goes up by 10 units.
- It goes up by 2 units.
A: It gets 10 times bigger.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: What happens to the pitch of a sound when the wavelength of the wave decreases?
- It increases.
- It decreases. (It is inversely related to wavelength.)
- It remains the same.
A: It increases.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: What is the frequency of a wave with a wavelength of 3.4 m and a frequency of 14 Hz in m/s?
- 47.6 (Correct.)
- 0.24 (You have a frequency, not the period.)
- 4.1 (This is not how you find speed.)
- 17.4 (This is not how you find speed.)
A: 47.6
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which wave property is most directly related to the amount of energy the wave is transporting?
- The amplitude of the wave.
- The speed of the wave.
- The frequency of the wave.
- The wavelength of the wave.
A: The amplitude of the wave.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: The wave shown below is moving to the right.  What type of motion would each part of the material that wave is traveling through move as the wave passes?
- Up and down. (That would be a different type of wave.)
- Side to side. (Correct.)
- To the right. (Overall the material does not move with a wave.)
A: Side to side.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: How many units is the wavelength of this wave?
- 4 (Correct.)
- 2 (That is only half of the wavelength.)
- 8 (The ruler is that long, but that is two wavelengths.)
A: 4
If right: Your answer is correct.
If wrong: Your answer is incorrect.