5*4 Sounds from Vibrating Air WDYS? . WDYT? Flutes and organ pipes produce sound by _____. The sound depends on the 1)_____, 2) _____ and 3)_____ of the air column. Long pipes = _____ pitch & frequency while short pipes = _____ pitch & frequency

5*4 DEMO(p518) Part A: Vibrations in Tube-Shaped Instruments 2c) The shorter the straw, the _____ the pitch. 3b) When the bottom of the straw is COVERED, the pitch is much _____. 4c) The shorter the air space in the tube, the _____ the pitch. 5a) The air molecules in the straw are _____. 5b) The test tube and bottom covered straw are(similar/different) because _____.

5*4 NOTES Compressing Air to Make Sound Sound is a compressional (_longitudinal__) wave, where air squeezes together (_compression_) or spreads out (_rarefaction_) Air (in the straw) is the __MEDIUM_ through which sound waves travel!!!

5*4 Physics Talk(p521) 2. Wave Diffraction Diffraction  sound waves travel by _bouncing off__ OR ___bending__ around barriers OR _spreading out____ as they emerge from an opening Draw and Label the diagram:

λ is INVERSELY related to f 5*4 Physics Talk(p521) 3. Vibrating Columns of Air The sound heard from straw & test tube was produced by a ____vibration___________ in air. Draw and Label the 2 pictures: . λ is INVERSELY related to f