3. What happens to the sound an object makes when the speed of vibrations decreases (slow down)?
A. Its volume will increase.
C.Its pitch becomes lower
B. Its pitch rises.
D. Its volume decreases.
4. Which of the following statements BEST explains why you can hear noises long distance at night?
A. There are fewer other noises at night.
B.Water conducts sound better at night.
C. Sound bounces off water better at night.
D.Sound waves are bent towards the cool air.
5.Which of the following is TRUE about effect of temperature to the rate of how sound travels?
A.Temperature increases the speed of sound.
B.Temperature decreases the speed of sound.
C. Warmer particles move at slower rate.
D. Warmer particles move at constant rate.
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ANSWER :
3.) What happens to the sound an object makes when the speed of vibrations decreases (slow down)?
4.) Which of the following statements BEST explains why you can hear noises long distance at night?
5.) Which of the following is TRUE about effect of temperature to the rate of how sound travels?
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