10 questions

18 minutes

See All test questions

1. What is the wavelength of a 5 Hz wave that travels with a speed of 10 m/s ?

2. A rope of length 5 m is stretched to a tension of 80 N. If its mass is 1 kg, at what speed would a 10 Hz transverse wave travel down the string?

3. A transverse wave on a long horizontal rope with a wavelength of 8 m travels at 2 m/s. At t = 0, a particular point on the rope has a vertical displacement of +A, where A is the amplitude of the wave. At what time will the vertical displacement of this same point on the rope be -A ?

4. A string, fixed at both ends, supports a standing wave with a total of 4 nodes. If the length of the string is 6 m, what is the wavelength of the wave?

5. A string, fixed at both ends, has a length of 6 m and supports a standing wave with a total of 4 nodes. If a transverse wave can travel at 40 m/s down the rope, what is the frequency of this standing wave?

6. A sound wave travels through a metal rod with wavelength λ and frequency f. Which of the following best describes the wave when it passes into the surrounding air?

Wavelength Frequency

7. In the figure below, two speakers, S_{1} and S_{2}, emit sound waves of wavelength 2 m, in phase with each other.

Let A_{P} be the amplitude of the resulting wave at Point P, and A_{Q} the amplitude of the resultant wave at Point Q. How does A_{P} compare to A_{Q}?

8. An organ pipe that's closed at one end has a length of 17 cm. If the speed of sound through the air inside is 340 m/s, what is the pipe's fundamental frequency?

9. A bat emits a 40 kHz "chirp" with a wavelength of 8.75 mm toward a tree and receives an echo 0.4 s later. How far is the bat from the tree?

10. Two cars starting from the same position begin driving along the same horizontal axis. If Car A's horn emits a sound wave, which of the following pairs of velocities would result in the greatest difference between the wave's source frequency and the perceived frequency for Car B?

Car A Car B