Difference between revisions of "4-WAV-03a"
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* Carry out pupil hearing range experiment using speaker and signal generator. Pupils will probably bring up the [http://en.wikipedia.org/wiki/The_Mosquito The Mosquito] at this point. | * Carry out pupil hearing range experiment using speaker and signal generator. Pupils will probably bring up the [http://en.wikipedia.org/wiki/The_Mosquito The Mosquito] at this point. | ||
==Main Body of Lesson== | ==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 | * Demonstrate nature of sound waves | ||
** [http://www.ltscotland.org.uk/5to14/resources/science/sound/soundpulse.asp Single pulse of sound in gas] | ** [http://www.ltscotland.org.uk/5to14/resources/science/sound/soundpulse.asp Single pulse of sound in gas] | ||
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* Speaker | * Speaker | ||
* Vacuum pump connected to Bell Jar | * Vacuum pump connected to Bell Jar | ||
| + | * Ultrasonic cleaner | ||
===Textbook References=== | ===Textbook References=== | ||
Revision as of 15:23, 11 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 that sound waves cannot travel through a vacuum.
Plenary
Homework
Additional Information
Resources Required
- Signal Generator
- Speaker
- Vacuum pump connected to Bell Jar
- Ultrasonic cleaner
