Grade 11 - Physics
Chapter 8 - Assignment
Name:_____________________
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. For a mechanical wave, the medium can be defined as
a. the average distance between a crest and a trough.
b. the average amplitude of the wave.
c. the material in which the wave travels.
d. the average distance between two crests.
Wave Phase Points
____
2. Refer to the diagram Wave Phase Points to answer this question.
Listed below are four pairs of points from the wave train diagram. Which of the pairs of points are in phase?
I. A and J
II. G and N
III. E and N
IV. C and L
a. I, II, and III
b. I, II, and IV
____
c. I, III, and IV
d. II, III, and IV
3. When straight waves in a ripple tank pass from a region of deep water to a region of less deep water, which of
the following can be observed for the waves?
I. The waves slow down.
II. The waves speed up.
III. The wavelength decreases.
IV. The wavelength increases.
a. I and III
c. II and III
b. I and IV
____
d. II and IV
4. Which of the following factors affect the speed of a wave through a stretched spring?
I. the amplitude of the wave
II. the length of the wave
III. the tension in the spring
a. I only
b. II only
c. III only
d. I, II, and III
____
5. A longitudinal wave is generated in a long spring. The locations along the spring where the medium contains
only kinetic energy are known as
a. compressions.
b. rarefactions.
c. either compressions or rarefactions.
d. neither compressions nor rarefactions.
____
6. A 2.40-m-long pulse is travelling at a speed of 5.75 m/s in a spring. How long does it take the pulse to pass
any point on the spring?
a. 0.318 s
c. 0.417 s
b. 0.375 s
d. 0.428 s
____
7. A 0.982-m-long pulse is travelling in a spring. If the pulse takes 0.224 s to pass any point in the spring, how
fast is it travelling?
a. 4.05 m/s
c. 4.87 m/s
b. 4.38 m/s
d. 5.16 m/s
____
8. A bat emits squeaks that have a frequency of
wavelength of the bat’s sonar?
a. 3.85 mm
b. 3.85 cm
____
. If the speed of sound in air is 325 m/s, what is the
c. 2.60 mm
d. 2.60 cm
9. A wave in a spring has a 0.960-m wavelength. If the frequency of the wave is 2.24 Hz, what is the speed of
the wave in the spring?
a. 1.81 m/s
c. 2.15 m/s
b. 1.96 m/s
d. 2.33 m/s
____ 10. A spring is stretched to a length of 8.25 m. You generate a wave in this spring by oscillating your hand back
and forth at a frequency of 2.38 Hz. If the wave takes 3.25 s to travel to the other end of the spring and back
to your hand, what is the wavelength of the wave that you generated?
a. 6.04 m
c. 5.59 m
b. 4.15 m
d. 2.13 m
____ 11. A spring is stretched to a length of 6.8 m. You generate a wave in this spring by oscillating your hand back
and forth to create a wave with a 1.4-m wavelength. If the wave takes 5.1 s to travel to the other end of the
spring and back to your hand, what is the frequency of the wave that you generated?
a. 1.9 Hz
c. 1.1 Hz
b. 1.5 Hz
d. 2.3 Hz
____ 12. An ultrasound system for medical use has a frequency of 12.0 MHz. When it passes through bone, the speed
of the ultrasound is
m/s. When it passes through muscle, the wavelength of this ultrasound is
. What is the ratio of the speed of the ultrasound in bone compared to its speed in muscle?
a.
c.
b.
d.
____ 13. Which of the following conditions are required for two waves to create a standing wave in a spring?
I. The waves must be travelling in opposite directions.
II. The waves must have equal amplitudes.
III. The waves must have equal wavelengths.
a. I and II only
b. I and III only
c. II and III only
d. I, II, and III
A Standing Wave Pattern in a Spring
____ 14. Refer to the diagram A Standing Wave Pattern in a Spring to answer this question.
For which of the following pairs of points is the distance between them equal to one wavelength?
I. A and C
II. B and D
III. C and E
a. I only
b. I and III only
c. II and III only
d. II only
____ 15. Refer to the diagram A Standing Wave Pattern in a Spring to answer this question.
The speed of the wave in the spring is 1.81 m/s. If the frequency of the standing wave is 0.850 Hz, the length
of the spring is
a. 1.43 m
c. 3.95 m
b. 1.98 m
d. 4.26 m
____ 16. The length of an organ pipe in a concert organ is 1.71 m. If the pipe is open at both ends, what is the
frequency of the note played by this pipe if the speed of sound is 328 m/s?
a. 83.2 Hz
c. 89.8 Hz
b. 95.9 Hz
d. 108 Hz
____ 17. A violin string has a length of 33.0 cm. What is the fundamental frequency for this string if the speed of the
wave in the string is 194 m/s?
a. 294 Hz
c. 335 Hz
b. 392 Hz
d. 588 Hz
____ 18. When the source of a sound wave is moving away from an observer, which of the following will appear to
occur?
a. The apparent frequency is greater than the true frequency of the sound.
b. The apparent frequency is less than the true frequency of the sound.
c. The apparent speed of the wave is less than the true speed of the wave.
d. The apparent speed of the wave is greater than the true speed of the wave.
____ 19. A police car that has a siren with a frequency of 525 Hz is approaching you at a speed of 35.0 m/s with its
siren on. If the speed of sound in the air is 342 m/s, what is the frequency at which you would hear the siren?
a. 628 Hz
c. 585 Hz
b. 613 Hz
d. 556 Hz
____ 20. The speed of sound in air is 326 m/s. What is the speed of a jet if the frequency you hear for its engine is 1.25
times the true frequency?
a.
km/h
c.
km/h
b.
km/h
d.
km/h
Numeric Response
21. A sound wave has a speed of 335 m/s in air. If the frequency of the sound is 256 Hz, what is the wavelength
of the sound? (Record your three-digit answer on the answer sheet.)
22. A clarinet is essentially a hollow tube with holes drilled in it to produce an open-pipe resonator. To create the
note called middle C, the clarinetist covers the holes along the body of the clarinet to produce a tube that is
64.1 cm long. If the speed of sound in air is 328 m/s, then the frequency of this note is ______ Hz. (Record
your three-digit answer on the answer sheet.)
Two-point Interference Pattern
Two in-phase point sources in a ripple tank, S1 and S2, generate the interference pattern
shown below. S1 and S2 are
apart. The maxima and minima are labelled from K to R.
23. Refer to the diagram Two-point Interference Pattern to answer this question.
A point located on line P is measured to be 2.10 cm farther from S1 than it is from S2. Any point on line K is
______ cm farther from S2 than it is from S1. (Record your three-digit answer on the answer sheet.)
24. A sound source that is moving toward you at a speed of 42.0 m/s has an apparent frequency of
. If the
true frequency of the sound source is
, then the speed of sound is ______ m/s. (Record your three-digit
answer on the answer sheet.)
Essay
25. The diagram below shows two pulses travelling in opposite directions in the same spring. Pulse P is moving
to the right while pulse Q is moving to the left. In the region where the pulses overlap, draw the resultant
pulse by applying the principle of superposition.