Difference between revisions of "4-WAV-03a"
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** [http://www.ltscotland.org.uk/5to14/resources/science/sound/solid.asp Sound waves in a solid] | ** [http://www.ltscotland.org.uk/5to14/resources/science/sound/solid.asp Sound waves in a solid] | ||
* Show pupils the [http://www.ltscotland.org.uk/5to14/resources/science/speedofsound.asp comparative speed of sound] in solids, liquids and gases (set a large value for distance (≈50000m)). | * Show pupils the [http://www.ltscotland.org.uk/5to14/resources/science/speedofsound.asp comparative speed of sound] in solids, liquids and gases (set a large value for distance (≈50000m)). | ||
− | * Demonstrate [[Measuring the Speed of Sound|how to find the speed of sound | + | * Demonstrate [[Measuring the Speed of Sound|how to find the speed of sound using the "clapper" method. |
* Demonstrate that sound waves cannot travel through a vacuum. | * Demonstrate that sound waves cannot travel through a vacuum. | ||
Revision as of 06:15, 19 November 2009
Contents
Outcomes
- Pupils can recall the hearing range of a human and determine whether a frequency lies within the range and understand that
- Pupils understand that any sound wave with a frequency greater than 20kHz is known as ultrasound.
- Pupils can recall different uses of ultrasound and can explain the idea of ultrasound scanning using an echo.
- Pupils can describe how to measure the speed of sound using a clapping method and an electronic method.
Specification References
Starter
- Carry out pupil hearing range experiment using speaker and signal generator. Pupils will probably bring up the The Mosquito at this point.
Main Body of Lesson
- Discuss the nature of ultrasonic sound.
- Discuss the uses of ultrasound in diagnostic sonography, therapeutic medicine, industrial nondestructive testing and cleaning. Why not bring in some jewellery and clean it in the lesson.
- Demonstrate nature of sound waves
- Show pupils the comparative speed of sound in solids, liquids and gases (set a large value for distance (≈50000m)).
- Demonstrate [[Measuring the Speed of Sound|how to find the speed of sound using the "clapper" method.
- Demonstrate that sound waves cannot travel through a vacuum.
Plenary
- Link frequency and amplitude to sound waves using audio clips.
Homework
Additional Information
Resources Required
- Signal Generator
- Speaker
- Vacuum pump connected to Bell Jar
- Ultrasonic cleaner
Textbook References
- Pople 6.03 pp. 128-135
Website References
Skills Addressed
- Awesomeosity