Unit 11 Quiz#1
PART I: Multiple Choice
For Questions #1-7, use the following five options to answer the questions. An option can be used more than once. Record answers on the scantron sheet.
1. May be expressed in units of Hz.
2. Number of waves passing by a given point per unit time.
3. Equals l/T
4. Reciprocal of the frequency.
5. Indicator of the amount of energy transported by a wave.
6. Depends only upon the properties of the medium through which a wave is traveling.
7. Maximum displacement of a particle of the medium from the rest position.
For Questions #8 - 14, read the following paragraph and select the appropriate word to fill in the blank. Record answers on the scantron sheet.
When a wave reaches a boundary between two media, part of the wave is reflected and part of the wave is transmitted. The amount of reflection which occurs __________ (#8 a-increases, b-decreases) as the similarity of the two media increases. The reflected wave may be inverted or erect depending upon the relative __________ (#9 a-density, b-compressibility, c-propensity) of the two media. When a wave travels along a slinky towards the wall to which it is attached, the reflected wave will be _____________ (#10 a-inverted, b-erect). When a wave travels from a slinky to a light string, the reflected wave will be _______________ (#11 a-inverted, b-erect). When a wave is transmitted through (i.e., passes into ) a boundary, its speed ____________ (#12 a-changes, b-remains the same) and its frequency __________ (#13 a-changes, b-remains the same). The wavelength of a wave (whether incident or transmitted) will be _____________ (#14 a-greatest, b-smallest) in the most dense media.
For Questions #15 - 25, choose the one best answer. Record answers on the scantron sheet.
15. A fly flaps its wings back and forth 150 times each second. The period of a wing flap is
16. A tennis coach paces back and forth along the sideline 10 times in 2 minutes. The frequency of her pacing is ________.
17. A sound wave is a mechanical wave; not an electromagnetic wave. This means that
18. Two waves are traveling through a container of nitrogen gas. Wave A has a wavelength of 1.5 m. Wave B has a wavelength of 4.5 m. The speed of wave B must be ________ the speed of wave A.
19. When water waves reach an obstacle in the medium, they bend around the obstacle into the region behind it. This is evidence of the phenomenon of
20. A standing wave is formed when
21. As declared by President Clinton, National Standing Wave month is the month of
22. Dawn and Aram have stretched a slinky between them and begin experimenting with waves. As the frequency of the waves is doubled,
23. If the energy in a longitudinal wave travels from south to north, the particles of the medium move
24. Which one of the following factors determines the pitch of a sound?
26. The antinumber of nodes in the standing wave shown in the diagram above right is
PART II: Short-Answer and Problem-Solving
27. Radio waves travel at the speed of light, 3.0 x 108 m/sec. What is the wavelength of a radio wave from an AM station broadcasting at a frequency of 750 kHz? (NOTE: 1 kHZ = 1000 Hz) PSYW
28. While hiking through a canyon, Noah Formula lets out a scream. An echo (reflection of the scream off a nearby canyon wall) is heard 2.0 seconds after the scream. The speed of the sound wave in air is 345 m/s. Calculate the distance from Noah to the nearby canyon wall. PSYW
29. Two boats are anchored 4 meters apart. They bob up and down every 3 seconds, but when one is up the other is down. There are never any wave crests between the boats. Calculate the speed of the waves. PSYW
30. Consider the wave shown below. In the space to the right of the diagram, sketch a wave with approximately twice the amplitude and one-half the wavelength. Use a ruler if necessary.
© Tom Henderson, 1996-1998
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