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A set of slides created to teach Sound to learners at Bishops Diocesan College in Cape Town.

A set of slides created to teach Sound to learners at Bishops Diocesan College in Cape Town.

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    Sound Sound Presentation Transcript

    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net SOUND K Warne
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Sound • Think of how a drum makes a noise. • All sounds are produced by vibrating objects.
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Sound • All sounds start with a vibration. • The vibrating object causes compresses and stretches out (rarifies) the air around the object. • These pressure fluctuations then spread out from the object in three dimensions. High Pressure Compression Low Pressure Rarefaction Vibration Waves spread out in three dimensions
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Experiment to measure the speed of sound Apparatus: – Loud noise - visual! (starter pistol) – Stopwatch, Pencil, notepad – “Clickometer” ( ( ( ( ( ( ( ( (
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Measuring the speed of Sound Time (s) Speed (m/s) 0.9 169 0.94 161.8 0.3 507 0.45 338 0.6 253.5 0.5 304.2 0.37 411.1 Distance = 0.72x167.5 + 50x0.63=152.1m Speed = distance/time AVERAGE SPEED = 306.3m/s Write up: Aim Theory Apparatus Method Results Analysis Graph Conclusion Evaluation
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Practical Write Up Aim - State what you were trying to prove or discover. Theory - Explain (briefly) the underlying theory - include a hypothesis (what you think about the practical) and a prediction ( what you think will happen) if appropriate. Apparatus - list everything used - in detail. Method - Describe what was done in steps and in detail. Results - List all results in a neat table including units. Analysis - Analyze your results to achieve your aim - calculations, graphs etc. All working must be shown clearly. Conclusion - What do your results show - have you achieved your aim. Evaluation - Evaluate the results - are they consistent? If not why do you think they vary? Do any of your results seem anomalous (out) how does this affect the overall result if you ignore it? Are there improvements you could suggest to make your results better?
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Transmission of Sound • Sound is transmitted as a ........................... Wave • It is a series of ......................... & .......................... • Solids - more dense - particles closer, Liquids - less dense - greater spaces, gases - least dense - large spaces. • Sound transmitted ................. in solids, then liquids then gases. • Factors affecting - wind, air pressure Air .............................. - .................pressure Air rarified - ............. pressure Vibrating Object • Sound cannot travel through a ...................... • If there is no ............... to carry the sound wave there can be no sound. Direction of .................
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Resonance • All objects possess their own natural ................... at which they can vibrate. • Any vibration at that natural frequency, in the same ............................, will cause the object to vibrate. 1. Singer generates vibrations at the .................. frequency of the wine glass. 2. Sound waves transmit the energy to the glass. 3. The glass begins to ..................... - and can shatter if the volume and ............... are right.
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Characteristics of Sound • Reflection - sound is ..................... off surfaces in the same way as other waves. • Reflected sound is called an .................. • Echo location - ............, ................... • Multiple reflections - acoustics - reflected sounds must be ................. (curtains or reflecting surfaces.) S = depth Distance = .......... x ......... Depth (s) = ................../2 Distance = 2xs
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Refraction of Sound • Sound travels .................. through warm air. • The sound waves .................... at night to follow the earths surface. • Sounds can be heard ........................ at night. ground At Night ................ air ..............air ground Daytime ..............air ............ air Sound is refracted ................ from the earth.
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Sound Volume Soft Sound The volume of a sound wave is determined by the amplitude of the vibration. Small Disturbance Large Disturbance Loud sound AirpressureAirpressure Low amplitude - air pressure does not change much. High amplitude - air pressure changes drastically. Sound intensity is measured in decibels.
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net How Loud?
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Harmonics • f1:
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Sound Pitch High Pitch Sound The pitch of a sound wave is determined by the frequency of the vibration. Low Pitch sound AirpressureAirpressure High pitch is caused by high frequency. Low pitch is caused by Low frequency.
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Ear
    • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Hi - This is a SAMPLE presentation only. My FULL presentations, which contain a lot more more slides and other resources, are freely available on my resource sharing website: www.warnescience.net (click on link or logo) Have a look and enjoy! WarneScience