MC	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

The __________ of a sound determines its loudness.

a. amplitude

b. resonance

c. timbre

d. frequency

Correct Answer: a

MC	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

A ray of light strikes a mirror at 30 degrees with the normal. What is the angle between the incident ray and the reflected ray?

a. 15 degrees

b. 30 degrees

c. 45 degrees

d. 60 degrees

e. 90 degrees

Correct Answer: d

MC	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

A ray of light strikes a lake at 35 degrees with the normal. What is the angle between the reflected ray and the lake?

a. 15 degrees

b. 35 degrees

c. 55 degrees

d. 75 degrees

Correct Answer: c

MC	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

A water wave in a ripple tank is moving at a speed of 10 cm/s with a wavelength of 4.0 cm. It moves into a new area of the ripple tank where the wavelength of the wave is 3.2 cm. The speed of the water wave in the new area is

a. 12.5 cm/s

b. 10 cm/s

c. 8.0 cm/s

d. 1.28 cm/s

Correct Answer: c

MC	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

A sound wave travels at 343 m/s and a compression passes by every 12 ms. What is the wavelength of this sound?

a. 1 m

b. 2 m

c. 3 m

d. 4 m

Correct Answer: d

I	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

In an experiment, you adjust the frequency of a wave and measure the resulting wavelengths. You obtain the following data:

Frequency, f (hz)	Wavelength, l (m)	Wavespeed, n (m/s)
5	0.4	2.00
8	0.25	2.00
11	0.182	2.00
14	0.143	2.00

1. What statement best describes the relationship between the variables?

a. Wavelength is proportional to frequency.

b. Frequency is proportional to wavespeed.

c. Wavespeed is proportional to wavelength.

2. What statement best describes the relationship between the variables?

a. Frequency and wavelength are directly proportional.

b. Frequency and wavelength are not proportional.

c. Frequency and wavelength are inversely proportional.

Correct Answers:

1. a

2. c

I	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

In an experiment, you adjust the frequency of a wave and measure the resulting wavelengths. You obtain the following data:

Frequency, f (hz)	Wavelength, l (m)	Wavespeed, n (m/s)
5	0.4	2.00
8	0.25	2.00
11	0.182	2.00
14	0.143	2.00

1. What relationship is being studied?

a. How frequency affects wavespeed.

b. How frequency affects wavelength.

c. How wavelength affects frequency.

d. How wavelength affects wavespeed.

2. Which is the independent variable?

a. Frequency

b. Wavelength

c. Wavespeed

3. Which is the dependent variable?

a. Frequency

b. Wavelength

c. Wavespeed

Correct Answer:

1. b

2. a

3. b

I	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

In an experiment, you adjust the frequency of a wave and measure the resulting wavelengths. You obtain the following data:

Frequency, f (hz)	Wavelength, l (m)	Wavespeed, n (m/s)
5	0.4	2.00
8	0.25	2.00
11	0.182	2.00
14	0.143	2.00

Which graph would be obtained from the data?

Correct Answer: e

I	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

Surfer dude (a non-scientist) found some nice waves while on a hike to an unfamiliar part of the coastal area. He visited this site many times during the next few days and recorded his observations. He even timed the waves and recorded their periodicity. Remembering the equation for frequency from his high school physics class he even calculated the frequency of the waves. That weekend he exclaimed to his buddies that he had found a great place to try surfing and stated how many waves could be expected per hour.

1. What would be the wisest reaction by his buddies?

a. Dismiss his claims; they sound too good.

b. Go check it out since even surfer dude can do good science.

c. DonÍt believe a word he says since only a real scientist could know this.

d. Get a scientist to prove his claims true or false.

Correct Answers: b

E	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

Compare and classify the basic properties of these types of radiation (the movement of energy along a straight line away from an energy source):

a. Sound

b. Light

Correct Answers:

a. Sound waves are an example of a material vibration. The energy is transmitted through a material medium by pressure variations. (2 points)

b. Electromagnetic radiation, in which energy is transmitted by variations in electric and magnetic fields. Electromagnetic radiation requires no material medium and travels through a vacuum. (2 points)

E	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

Describe the sound a note makes with a large amplitude and small frequency. Identify something that makes this sound?

Correct Answer:

Loud and low. Foghorn (Answers will vary.)

Scoring Guide:

2 points for correctly identifying the sound

1 point for correctly identifying a possible source

P	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

Slinky Waves

Materials:

slinky or long spring

meter stick

Polaroid camera

stopwatch

Procedure:

1. Place a slinky on a table. Hold one end fixed while generating a single transverse pulse at the other end. Sketch the shape of the generated pulse and of the reflected pulse.

2. Produce both the transverse and the longitudinal pulses in the slinky and describe the differences. (Notice the speed difference).

3. Generate a transverse periodic wave in the slinky, and determine its wavelength, (Place a meter stick near the slinky and take a picture).

W=__________

4. Use a stopwatch to determine the period (T) of the wave.

T=__________

5. Calculate the velocity of the wave.

6. Adjust the frequency of the periodic waves until a standing-wave pattern is observed. Draw a sketch of the standing wave pattern.

Correct Answers:

1. (2pts) The sketch should show a single crest going into the fixed point, and a crest going out of the fixed point but on the other side. The crest will invert when reflected.

2. (2pts) In the longitudinal wave motion, the vibration is parallel to the direction of the energy propagation. It is also faster than the transverse wave.

(2pts) In the transverse wave, the vibration is perpendicular to the direction of propagation of energy. It is also slower than the longitudinal wave.

3. Answer varies = __________ (2pts)

4. Answer varies T = __________ (2pts)

5. Answer varies, however the students should of used the following equation:

v = / T (2pts)

6. The sketch should look like the sine wave (2pts)

P	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

A ray of light strikes a swimming pool at an angle of 32 degrees with the normal. Find the index of refraction of the pool if the angle of refraction is 25 degrees. Show your work.

Correct Answer: 1.25

P	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

The index of refraction of diamond is 2.42. What is the speed of light in diamond? Show your work.

Correct Answer: 1.24 x 10⁸ m/s

P	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

The whistle on a train has a frequency of 440 Hz. The train is moving at 35.0 m/s toward a person standing beside the tracks. If sound travels at 345 m/s, what is the wavelength of the sound heard by the person?

Correct Answer: 0.70 m

P	Physics	Standard: 05
Objective: 01. Demonstrate an understanding of mechanical waves in terms of general wave properties.
ILO:

A police car with a siren having a frequency of 365 Hz is approaching a stationary observer at a speed of 75 km/h. What will the frequency of the siren appear to be if sound travels at 345 m/s?

Correct Answer: 388 Hz