SOUND

Fill in the blank using vocabulary from this unit. Soundis a form of energyassociated with the vibration of matter. Vibrationsoccur when matter moves back and forth quickly. Sound is considered to be a longitudinal wave, which means the particles of the mediumvibrate. A longitudinal wave has compressions, where there is a reduction in volume and atoms compress, and rarefactions; where atoms are not compressed. The number of waves that pass a point in a given amount of time is called frequency. The frequency is measured in hertz and impacts the pitch of the sound. The higher the frequency, the higher the pitch. Loudness of a sound wave is based on the amplitude. Loudnessrefers to how intense the sound is. For example, a train passing by has a high amplitudeand we know that because the sound is very loud. Loudness is measured in decibels.Remember: Sound can be reflected just like light can be. When sound is reflected we call it an ECHO!!! Manipulating the Sound Wave Match the properties of the sound wave we changed to how we would hear it. High Pitch (screaming) High Frequency Loud sounding High Amplitude Soft sounding Low Amplitude Low Pitch (whisper) Low Frequency Increasing the loudness Increasing the Amplitude Ear Diagram Label the parts of the ear. Make sure you spell the parts of the ear correctly. Outer Ear Hammer Anvil Auditory Nerve Eardrum Cochlea Stirrup Ear Canal What is inside the cochlea that helps us hear? (Once it is broken or damaged it is NEVER repaired) open spaces cartilage antennas cilia