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 Investigate (p518) 2c) The shorter the straw, the _____ the pitch. 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) A pop bottle and bottom covered straw are(similar/different) because _____.

5*4 Investigate (p518) Part B: Spreading & Bending of Sound Waves What was the effect of cupping your ears? What was the effect of using the mega phone? What must have happened the sound waves in the hall?

5*4 Investigate (p518) Part C: Making a Reed Instrument What happened as you shorted the instrument?

5*4 NOTES (p521) Some Properties of Sound Waves Compressing Air to Make Sound Sound is a compressional (_____) wave, where air squeezes together (_____) or spreads out (_____) Air (in the straw) is the _____ through which sound waves travel!!! Draw the test tube situation:

5*4 NOTES(p521) Some Properties of Sound Waves 2. Wave Diffraction Diffraction  sound waves travel by _____ OR _____ around barriers OR _____ as they emerge from an opening Draw and Label the diagram:

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

5*4 Checking Up (p523) Sound travels through air in _____ waves. Sound waves diffract when they _____ from smaller openings OR _____ direction. The equation for wave speed is _____; if the wavelength increases, then the frequency _____.

5*4 PTG (p526) 1a) The string is vibrating, and the air in the pipe is also _____. 1b) The string vibration is _____, while the air vibration is _____. 2c) When one end is covered, if you double (×2) the length, then the frequency is cut in _____. When both ends are OPEN, the frequency will be _____.

5*4 PTG (p526) 3a) The length of the longest organ pipe is _____. 3b) Draw and Label: 3c) The wavelength of the standing wave is _____. 3d) λ is INVERSELY related to f

5*4 PTG (p526) 4a) The wavelength (λ) is _____. 4b) The frequency (f)is _____. 4c)The NEW (λ) is _____. 4d) The NEW (f)is _____. 5. The frequency (f)is _____. Therefore, the frequency is _____ that 4b).

5*4 PTG (p526) 6a) The spreading of waves into a region behind an obstruction is called _____. 6b) Draw and Label the diagrams: 7. v =d / t d= v × t t = d / v