1 Sound and Hearing 2 Speed of sound The speed of sound in air is around 330 m/s. What happens when sound travels through different materials Speed of sound (in m/s) Material Conclusion the denser the material the faster sound travels through it 3 Making Sounds A sound is made when an object or material VIBRATES. Take for example a guitar. To make a sound with a guitar a string has to vibrate. We can raise the pitch of the sound a guitar makes by doing three things 1) _________ the length of the string 2) _________ the string 3) Using a _________ string We can make the sound louder by ________ the string harder Words tightening thinner increasing plucking 4 Using an oscilloscope 1) Quiet sound low frequency 2) Quiet sound high frequency 3) Loud sound low frequency 4) Loud sound high frequency 5 How sound travels As we know sound waves are formed when something vibrates. But how does the sound reach our ears Air molecules 6 How does the ear work
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