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Sound waves are caused by vibrations Your hearing can be damaged by high-intensity sounds The intensity of a sound is determined by its amplitude Nina listens to an ambulance as it travels past her. The sound of the siren decreases in pitch The sound of your voice is produced by the force of air making your vocal cords vibrate Jorge wants to make the pitch of a sound wave lower. He should decrease its frequency Brian turns up the volume on his stereo. The stereo sends an electrical signal to the speakers. The signal changes the sound's intensity To raise the pitch of the sound caused by a sound wave, increase the frequency of the sound A sound wave has a frequency of 300 hertz. How many complete wavelengths of this wave pass a fixed point in one second? 300 Anna plays a note on a clarinet. Fred plays the same pitch on a violin. The two notes sound different. This is because the two notes have different overtones Sound becomes softer at a distance because the energy of the sound wave is spread over a greater area, decreasing its intensity A car's muffler and some kinds of acoustical tile make sounds softer by absorbing energy from sound waves Intense sounds can damage your hearing by damaging the hair cells of the cochlea A mechanical wave always transfers energy through a medium The frequency of a wave is measured in hertz Sound travels faster in materials that are denser If you compare the sound of a motorcycle being driven toward you to the sound of the same one being driven away, you are hearing the Doppler Effect The bones of the middle ear carry vibrations from the eardrum to the inner ear When you speak, your vocal cords vibrate to produce sound A sound wave transfers kinetic energy between particles by compressing them Sound waves can not travel through a vacuum As the temperature of the medium increases, the speed of sound increases