43. Sound waves do NOT carry energy a. True b. False

13. As an anchor is being hoisted out of water, it hits the hull of the ship, causing the anchor to vibrate with a frequency of 150Hz. If the speed of sound in sea water is 1520 m/s, how many wavelengths of sound will fit between the boat and the ocean bottom 395 m below? *       a. 59       b. 39       c. 87       d. 69       e. None of the above

Acoustic reflectance of rigid bodies is normally that of human bodies: a. less than O b. greater than O c. equal to

12. Blue whales use sound waves to communicate and emit calls with frequencies of around 10H2 - 40Hz. These Humans can perceive some of these sounds while the others would be considered a. ultrasonic waves. c. supersonic b. infrasonic d. audible