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

Chapter 2: Sound

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