Physics 101 - World Wide Web Example Exam I Click here for answers.

1. Changing which of the following affects the period of a pendulum?
a) mass
b) amplitude
c) length
d) angle

2. If you double the frequency of a vibrating object, what happens to the period?
a) the period doubles
b) the period stays the same
c) the period is cut in half
d) not enough information is given to answer this question.

3. A pendulum passes the nose of an observer 24 times in 2 seconds. (Assume that the observers nose is at one of the endpoints of the pendulums path.) The frequency of the pendulum is
a) 36 Hertz
b) 12 Hertz
c) 18 Hertz
d) 18/3 Hertz

4. The distance from trough to trough on a periodic wave is called its
a) frequency.
b) period.
c) wavelength.
d) amplitude.

5. Suppose that a train whistle at rest has a frequency of 3000 Hertz. If you are standing still and observe the frequency to be 3010 Hertz (higher pitch), you can conclude that
a) the train is moving away from you.
b) the train is moving toward you
c) the sound from the whistle has echoed
d) not enough information is given

6. Radio waves travel at the speed of light, 300,000 km/s. For 300 MHz radio waves, the wavelength is…
a) 1 meter
b) 1000 meters
c) 1,000,000 meters
d) 1/1000 meters

7. Of the following properties of a wave, the one that depends only on the type of medium is
a) amplitude
b) wave speed
c) wavelength
d) frequency

8. Reverberation is actually a case of
a) sound interference.
b) forced vibrations.
c) re-echoed sound.
d) resonance.
e) none of these.

9. The Tacoma Narrows Bridge collapse is an example of
a) forced vibration
b) sound vibration
c) resonance
d) standing water waves

10. The speed of sound is about 340m/s. If someone fires a gun near a cliff and hears an echo four seconds later then the cliff is about
a) 170 meters away.
b) 340 meters away.
c) 680 meters away.
d) 3400 meters away.
e) 6800 meters away.

11. Which of the following is not a medium which will transmit sound?
a. solids
b. liquids
c. gasses
d. vacuum

12. The first harmonic of a guitar string has ______nodes.
a) 1
b) 2
c) 3
d) 4

13. A sound wave has a wavelength of 6 meters. The distance from a compression center to the adjacent rarefaction is
a) 0.75 meters
b) 1.5 meters
c) 3 meters
d) unknown unless the wave speed is given.
e) unknown unless the frequency is given.

14. The first medium in the correct list below transmits the fastest sound waves and the last medium transmits the slowest sound waves.
a) water, steal, air
b) air, steel, water
c) steel, water, air
d) water, air, steel

15. Dipping a finger in water faster and faster causes the wavelength of the spreading waves to
a) increase
b) decrease
c) stay the same
d) not enough information is given

16. The number of vibrations per unit time is called the
a) wavelength.
b) period.
c) frequency
d) node

17. The time for one vibration is called the
a) wavelength.
b) period.
c) frequency
d) amplitude

18. The magnitude (or value) of the wave speed is given by
a) frequency divided by the period
b) period times the frequency
c) frequency times wavelength
d) wavelength times period

19. When you are in a swing, the time it takes to go from the highest point in front of the swing back to the highest point in front of the swing is
a) ¼ period
b) ½ period
c) ¾ period
d) one period

20. A skipper on a boat notices wave crests passing his anchor chain every 5 seconds. If the wave crests are 15 m apart, what is the speed of the water waves in m/s?
a) 5
b) 15
c) 75
d) 10
e) 3

21. A 250 Hz tuning fork and a 260 Hz tuning fork are vibrating near each other. How many beats per second are heard?
a) 255
b) 510
c) 10
d) 250
e) 260

22. Frequencies of sound that are too high for the human ear to hear are called
a) supersonic
b) infrasonic
c) ultrasonic
d) subsonic
e) sonic drive-in

23. The bending of sound through air of uneven temperature is called
a) reflection
b) refraction
c) interference
d) reverberation
e) resonance

24. We can distinguish between the sound of a wrench dropped on a floor and a baseball bat dropped on a floor because of
a) reverberation
b) resonance
c) interference
d) natural frequency
e) beating

25. Two waves having the same amplitude and frequency interfere as a crest meets a trough. The results will be…
a) constructive interference
b) destructive interference
c) resonance
d) a standing wave

26. A violin and a piano sound different because they play sounds of different
a) amplitude
b) wavelength
c) frequency
d) quality

27. What is the wavelength of the 1st Harmonic in a 10 meter organ pipe that is open at both ends?
a) 10 meters
b) 5 meters
c) 2.5 meters
d) 20 meters
e) none of these

28. A guitar string can vibrate at the frequencies listed. Which of the following is its second overtone?
a. 100 Hz
b. 200 Hz
c. 300 Hz
d. 400 Hz

29. The longitudinal waves produced on a slinky more closely represent which of the following waves?
a. water waves
b. light waves
c. sound waves
d. transverse waves on a guitar string

30. In an open ended organ pipe there are always an odd number of nodes when a sound is produced.
a. true b. false

31. The lowest frequency that can be produced on a guitar string has a wavelength ________ as long as the string.
a. twice
b. half
c. four times
d. one fourth

32. A vibrating tuning fork causes an identical fork to vibrate. This is called ___________.
a. refraction
b. resonance
c. beats
d. reverberation

33. _________ is the bending in the direction a wave travels due to the fact that the medium is not uniform.
a. refraction
b. transmission
c. reflection
d. absorption