1. 8L SOUND AND HEARING

2. Sound introduction What causes sound? Name a soft sound. Name a loud sound.

3. Why not? In space no-one can hear you scream

4. Pitch Name a high pitch sound. What are the vibrations like in a high pitch sound? Name a low pitch sound. What are the vibrations like in a low pitch sound?

5. Tuning fork http://faraday.physics.utoronto.ca/IYearLab/In tros/StandingWaves/Flash/tunefork.html http://faraday.physics.utoronto.ca/IYearLab/In tros/StandingWaves/Flash/tunefork.html

6. Seeing sound! How does sound travel? What equipment do we use to show sound in the laboratory?

7. Oscilloscope http://www.educationscotland.gov.uk/resources /s/sound/oscilloscope.asp

8. Which picture shows how sound travels? How does this compare to the oscilloscope?

9. Sound waves Which word describes the “height” of wave? Which word describes the “length” of a wave? Which word describes the “speed” of a wave? What is the unit of frequency?

10. Wave diagram What changes when the pitch changes? What changes when the loudness changes? http://www.bbc.co.uk/schools/gcsebitesize/science /aqa/waves/generalwavesrev3.shtml

11. The loudness depends on how much energy the sound wave has. In an electric key board an amplifier makes the sound louder. A louder note has a bigger amplitude. (height)

12. The pitch depends on how many vibrations there are. The more frequent the vibrations the higher the note. The fewer the vibrations the lower the note

13. The higher the note, the more waves per second so the waves are squashed together. The waves will have a short wave length.

14. The lower the note, the FEWER waves per second so the waves are spread out. The waves will have a longer wave length.

15. Different instruments produce different shaped wave traces. The extra wiggles are known as harmonics. These give the instrument its “colour”.

16. Upd8 Fingerphone

17. The human ear Which part of the ear “funnels the sound”? Which part of the ear vibrates and makes the ear bones vibrate? Which part of the ear sends the message to the brain? Name some causes of hearing problems.

18. Ear videos

19. The human ear Ear Canal Ear bones Ear Drum Cochlea Auditory Nerve Outer ear (Pinna)

20. Online hearing test http://onlinetonegenerator.com/hearingtest.html

21. Loudness What is the unit of loudness of sound? What is noise pollution? How can it be reduced?

22. Noise levels in the school PlaceNoise level (dB)

24. Ruler sound experiment

25. Investigating ruler sound What could you change? (Independent variable) What could you measure? (dependent variable)

26. Now choose your variables with your partner ONE independent, ONE dependent, MANY control Write the aim, prediction, variables, equipment BEFORE you start the experiment. Remember to REPEAT the experiment