P2, Physics 12
P2, Physics 12 Worksheet-5S Student Name _____________
1. The tension in a guitar string is increased by a factor of two. By what factor does the wave velocity change?
a. 2.0 b. 1.4 c. 0.7 d. 0.5
2. Tripling the density, in mass per unit length, of a guitar string will result in changing the wave velocity in the string by what factor?
a. 0.58 b. 1.00 c. 1.73 d. 3.00
3. A radio wave has a speed of 3 x 108 m/s and a frequency of 107.7 MHz. What is its wavelength?
a. 3.21 m b. 45.0 m c. 0.10 m d. 2.78 m
4. A standing wave is set up in a 200 cm length string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120 Hz source. What is the wavelength?
a. 10 cm b. 20 cm c. 40 cm d. 80 cm e.100 cm
5. A standing wave is set up in a 1.5m length string fixed at both ends. The string vibrates in 4 distinct segments when driven by a 180 Hz source. What is the natural fundamental frequency of the string?
a. 45 Hz b. 90 Hz c. 240 Hz d. 600 Hz e. 630 Hz
6. A standing wave is set up in a 2.0 m length string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120 Hz source. In how many distinct standing wave segments would the same string vibrate if the tension were increased by a factor of 4?
a. 3 b. 10 c. 20 d. No standing wave pattern occurs.
7. If a 1000 Hz sound source moves at a speed of 50.0 m/s toward a listener who moves at a speed of 30.0 m/s in a direction away from the source, what is the apparent frequency heard by the listener? (The velocity of sound is 340 m/s.)
a. 937 Hz b. 947 Hz c. 1060 Hz d. 1070 Hz
8. What is the lowest frequency that will resonate in a 2 m length organ pipe, closed at one end? The speed of sound in air is 340 m/s.
a. 42.5 Hz b. 85 Hz c. 170 Hz d. 680 Hz
9. The trough of the sine curve used to represent a sound wave corresponds to which of the below?
a. condensation b. rarefaction c. region of low elasticity
d. point where molecules vibrate at a right angle to the direction of wave travel
10. A source of S of sound and a listener L each can be at rest or can move directly towards or away from each other with speed v0. In which of the following situations will the observer hear the lowest frequency of sound from the source?
A. B. C. D. E.
11. The frequencies of the first two overtones (second and third harmonics) of a vibrating string are f and 3f/2. What is the fundamental frequency of this string?
A. f/3 B. f/2 C. f D. 2f E. 3f
12. Plane sound waves of wavelength 0.12 m are incident on two narrow slits in a box with nonreflecting walls, as shown below. At a distance of 5 m from the center of the slits, a first-order maximum occurs at point P, which is 3 m from the central maximum. The distance between the slits is most nearly
A. 0.07 m B. 0.09 m C. 0.16 m D. 0.20 m E. 0.24 m
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