WAVE INTERACTIONS.

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Presentation transcript:

WAVE INTERACTIONS

Longitudinal Wave Compressional Wave wave particles vibrate back and forth along the path that the wave travels. Compressional Wave

Compressions The close together part of the wave Rarefactions The spread-out parts of a wave

Transverse waves wave particles vibrate in an up-and-down motion.

Transverse waves Crests Highest part of a wave Troughs The low points of the wave

Amplitude- Frequency is the maximum distance the particles in a wave vibrate from their rest positions. (The farther the sound travels, the louder it is and vis versa.) Frequency - the number of waves produced in a given time (The faster the waves the higher the pitch, the slower the waves the lower the pitch)

Waves transfer energy without transferring matter. Frequency= waves/time

II. Properties of Sound

- description of how high or low Pitch - description of how high or low the sound seems to a person . Loudness- how loud or soft a sound is perceived to be.

Loudness of Sound in Decibels Loudness (dbs) Hearing Damage Average Home 40-50 Loud Music 90-100 After long exposure Rock Concert 115-120 Progressive Jet Engine 120-170 Pain

Ultrasound Infrasound Sounds in the range from 20-100kHz - sound waves with frequencies above the normal human range of hearing. Sounds in the range from 20-100kHz Infrasound - sounds with frequencies below the normal human range of hearing. Sounds in the 20-200 Hz range

Interference the result of two or more sound waves overlapping (Constructive vs. Destructive)

Resonance exactly matches the natural frequency of an object. the frequency of sound waves exactly matches the natural frequency of an object. Or - when one object vibrates at the same natural frequency of a second object, which forces that second object into a vibration motion. Harmonics – are caused when a sound frequency accidentally produces another faint sounds. https://www.youtube.com/watch?v=IZD8ffPwXRo

Different sounds that you hear include (A) noise, (B) pure tones (produced by a machine), and (C) musical notes (IE. Voice/instrument).

Doppler Effect is the apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound. https://www.youtube.com/watch?v=h4OnBYrbCjY

Let’s Apply this knowledge! http://www.youtube.com/watch?v=6f0hsbF HYvs *Have a piece of paper Put your name Your Group number on it. Once done, get into your groups. Lets observe some science experiments!