2 Sound Waves Caused by vibrations of molecules. The molecules bump each other and the sound wave transfers energy.Remember they are a type of compressional wave, so sound has to have matter to travel through.
3 The Speed of SoundTravel at different speeds through different mediumsBecause in a ________ the particles are closer together, sound travels faster in this type of matter.Because particles in a warm substance move _________, sound travels faster in this temperature
4 Amplitude and Loudness Loudness: Human perception of how much energy a sound wave carriesAmplitude in compressional wave: The more compressed the compressions and the more spread out the rarefactions, the higher the amplitude.Higher amplitude=more energy
8 Frequency and PitchPitch: how low or high it soundsThe higher the pitch, the higher the frequencyThe higher the frequency, the smaller the _____________.
9 The Human Voice Vocal cords vibrate as you speak or sing. The length and thickness of your vocal cords determine the pitch of you voice.Short or thin vocal cords= higher frequency/higher pitch voicesThink or long vocal cords=lower frequency/lower pitch voices
11 The Doppler EffectThe change in frequency as the source of sound is moving relative to the listener.Example: ambulance, chiming clockRemember 6th grade science?
12 As planets move away from us, their light is shifted to lower frequencies. What color has a lower frequency in the rainbow?So this is called a _____ __________.As planets move toward us, their light is shifted to higher frequencies.What color has a higher frequency in the rainbow?So this is called a _______ _________.
14 Just Like Me Country? Rap? Metal? Pop? 80’s? 90’s? Alternative? Boy Bands?
15 MusicA group of sounds that have been deliberately produced to make a regular pattern.Created by vibrations
16 Every object will vibrate at a certain frequency Natural FrequencyEvery object will vibrate at a certain frequencyDepends on shape and size of the object, or instrument
17 ResonanceOccurs when an object is made to vibrate at its natural frequencies by absorbing energy from a sound wave or another object vibrating
18 The higher frequencies produced by a vibrating object OvertonesThe higher frequencies produced by a vibrating object
19 Stringed InstrumentsPitch of the sound depends on the length, diameter, and tension of the stringStringed instruments usually have a hollow chamber that amplifies the soundsExample: guitar, piano, cello
20 Percussion Instruments that are struck to make sound Pitch depends on the length and tightness of the drumhead or barsExample: Drums & xylophone
21 Brass and Woodwinds Instruments with pipes or tubes Pitch depends on air column or length of pipes/tubesExample: Flute, saxophone, clarinet, oboes
22 ReverberationRepeated echoes of sound because of a hard surface
23 The Outer EarCollects sound and directs to ear canal- reason ear is shaped like a funnel
24 The Middle Ear Sound waves reach middle and vibrate the eardrum Transmits vibrations to 3 small connected bones- hammer, anvil, and stirrup
25 The Inner Ear Fluid filled part of ear Different sounds vibrate in different ways