1) Which of the following is produced by vibrations of particles? a) light b) sound 2) True or False: Sound is a mechanical wave thus, it needs a medium for it to travel. a) True b) False 3) Where does sound travel fastest? a) solid b) liquid c) gas 4) Where does sound travel slowest? a) solid b) liquid c) gas 5) Why does sound travel fastest in solids? a) because the particles are very much close to each otheer b) because it it heavier 6) Which of the two will you notice first? a) thunder b) lightning 7) True or False: The higher the temperature, the more kinetic energy the particles have, the faster the vibration and so the faster the speed of sound. a) True b) False 8) Which of the following is the bouncing back of sound waves as it hits a barrier? a) Reflection b) Refraction 9) Which of the following is the bending of sound waves as it travels in medium of different density? a) reflection b) refraction 10) Which of the following refers to the highness or lowness of sound? a) Frequency b) Amplitude c) Pitch

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