1. Which of the following is a false statement?

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Presentation transcript:

1. Which of the following is a false statement? (A) Sound waves are longitudinal pressure waves. (B) Sound can travel through a vacuum. (C) Light travels very much faster than sound. (D) The transverse waves on a vibrating string are different from sound waves. (E) "Pitch" (in music) and frequency have approximately the same meaning.

2. 3. In general, sound is conducted fastest through (A) gases. (B) liquids. (C) solids. (D) a vacuum. 3. What is the speed of sound in a steel rod? (A) 1500 m/s (B) 3000 m/s (C) 5000 m/s (D) 8000 m/s

4. As the temperature of the air increases, what happens to the velocity of sound? (Assume that all other factors remain constant.) (A) It increases. (B) It decreases. (C) It does not change. (D) It increases when atmospheric pressure is high and decreases when the pressure is low. 4.

5. Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz sound through air is (A) twice as great. (B) the same. (C) one-half as great. (D) none of the above 6. Compared to the wavelength of a 400 Hz sound, the wavelength of a 200 Hz sound in air is (A) twice as long. (B) the same. (C) one-half as long. (D) none of the above

7. Sound vibrations with frequencies greater than 20,000 Hz are called (A) infrasonics. (B) ultrasonics. (C) supersonics. (D) none of the above 8. Sound vibrations with frequency less than 20 Hz are called (A) infrasonics. (B) ultrasonics. (C) supersonics. (D) none of the above

9. Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be (A) unchanged. (B) half as great. (C) one-fourth as great. (D) twice as great.

10. 11. For spherically diverging waves, intensity is proportional to (A) R2. (B) R. (C) 1/R. (D) 1/R2. 11. Which of the following increases as a sound becomes louder? (A) frequency (B) wavelength (C) amplitude (D) period (E) velocity

12. You move slowly toward a speaker emitting a pure tone. What characteristic of the sound increases? (A) frequency (B) amplitude (C) wavelength (D) period 13. What determines "loudness" of a musical note? (A) frequency (B) velocity (C) phase (D) amplitude

14. 15. What determines the "pitch" of a musical note? (A) amplitude (B) wavelength (C) frequency (D) phase When sound passes from air into water (A) its wavelength does not change. (B) its frequency does not change. (C) its velocity does not change. (D) all of the above 15.

16. Consider the standing wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in common? (A) They have the same wavelength. (B) They have the same velocity. (C) They have the same frequency. (D) More than one of the above is true. (E) None of the above is true.