Unit 12 Quiz#1
1. When two waves meet along the same medium, _____________ occurs.
2. A sound wave is different than a light wave in that a sound wave is
3. The "buzz" of a mosquito produces an intensity having a 40-dB rating. How many times more intense is the sound of normal conversation if it has an intensity rating of 60-dB?
4. The book describes a sound wave as a pressure wave; regions of high (compressions) and low pressure (rarefractions) are established as the result of the vibrations of the sound source. These compressions and rarefractions result because sound
5. An open-end resonance tube sounds out a fifth harmonic at 1600 Hz. The frequency of the third harmonic is
6. By definition, the fundamental frequency is
7. Two notes which have a frequency ratio of 2:1 are said to be separated by an octave. A note which is separated by an octave from middle C (256 Hz) is
8. The pitch of a sound refers to the __________ of the sound wave.
9. As the amplitude of a sound wave increases, the energy transported by the wave
10. Sound waves are known to exhibit the Doppler effect. This means that
11. Doubling the frequency of a wave source doubles the speed of the waves.
Consider the standing wave pattern below in answering this next three questions.
12. This standing wave pattern represents the _____ harmonic.
13. The number of nodes in the entire pattern is
14. Destructive interference occurs at point(s)
15. A 120-cm closed end resonance tube resonates with the frequency of the fifth harmonic. The wavelength of the fifth harmonic is
Two speakers are arranged so that sound waves with the same frequency are produced and radiate through the room. An interference pattern is created (as represented in the diagram below). The thick lines in the diagram represent wave crests and the thin lines represent wave troughs. Use the diagram to answer the next four questions.
15. Which two points are located on the same nodal line?
16. Which two points are located on the same nodal line?
17. At which point(s) would constructive interference occur?
18. How many of the six labeled points represent anti-nodes?
19. The time required for the waves (v = 340 m/s) to travel from the tuning fork to point P is
Problem-Solving and Short Answer
20. Microwaves are electromagnetic waves which travel through space at a speed of 3.0 x 108 meters/sec. Most microwave ovens operate at a frequency of 2450 MHz (NOTE: 1 MHz = 1 x 106 Hz). Determine the wavelength of these microwaves. PSYW
21. Miles Tugo is camping in Glacier National Park. In the midst of a glacier canyon, he makes a loud hollar. He hears an echo 2.0 seconds later. The air temperature is 20-degrees C. How far away are the canyon walls. PSYW
22. A guitar string has a set of natural frequencies. Calculate at least three values of the set for a 60.0-cm guitar string. Assume the speed of a wave in the metal string is 480 m/s. PSYW
© Tom Henderson, 1996-1998
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