1) The velocity of sound at room temperature is a) 20m/s b) 200m/s c) 343 m/s 2) Speed of sound changes with medium a) True b) False 3) Speed of sound changes with frequency a) True b) False 4) The reflection of sound when it hits a hard surface is called a) Refraction b) Echo c) Transmission 5) Sound level is measured in a) m/s b) decibel c) level 6) When pressure amplitude increases by a factor of 10Pa, sound level increase by a) 0 db b) 10 db c) 20 db

Chapter 2: Sound

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