ASSESSMENT: Choose the letter of the correct answer. Write the letter of your answer before the number. 1. Which of the following factors does the speed of sound depend? A. density B. elasticity C. temperature D. all of the above 2. An echo occurs when a sound wave is A. absorbed B. reflected C. refracted D. transmitted 3. What happens to the speed of sound as the temperature increases? A. constant B. decreases C. increases D. cannot be determined 4. Which phenomenon explains why sound is heard at longer distances at night than in day? A. echolocation B. reflection C. refraction D. reverberation 5. How fast does sound travel if the air temperature is 20 OC? A. 334 m/s B. 340 m/s C. 343 m/s D. 345 m/s 6. Which of the following is true about the effect of air temperature on the speed of sound? A. The lower the temperature the faster the speed. C. The higher the temperature the slower the speed. B. The higher the temperature the faster the speed. D. The temperature does not affect the speed of sound. 7. What is the relationship of temperature to the speed of sound? A. equal B. no relationship C. directly proportional D. inversely proportional 8. Sound travels faster through warm materials than cold materials because A. warm particles move slowly C. warm particles are moving quickly B.gas particles are packed tightly D. sound does not travel faster through a warm substance 9. Ships use echolocation to measure the A. size of fish B. area of ocean C. depth of water D. density of water 10. When the direction of a wave changes as it passes from one medium to another, it is called B. echo C. reflection D. refraction A.density​