Difference between revisions of "4-WAV-03a"
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* Discuss the nature of ultrasonic sound. | * 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. | * 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. AGR has great videos. |
** [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] | ||
** [http://www.ltscotland.org.uk/5to14/resources/science/soundingas.asp Sound waves in gas] | ** [http://www.ltscotland.org.uk/5to14/resources/science/soundingas.asp Sound waves in gas] | ||
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* Demonstrate [[Measuring the Speed of Sound|how to find the speed of sound]] using the "clapper" method. | * 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. | ||
| − | + | * Pupils will probably ask about [http://www.liveleak.com/mp.swf?config=http://www.liveleak.com/flash_config.php?token=6c3_1254185548%26embed=1 shattering a glass with sound]. | |
==Plenary== | ==Plenary== | ||
* Link frequency and amplitude to sound waves using audio clips. | * Link frequency and amplitude to sound waves using audio clips. | ||
Revision as of 14:17, 1 December 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. AGR has great videos.
- Show pupils the comparative speed of sound in solids, liquids and gases (set a large value for distance (≈50000m)).
- Demonstrate how to find the speed of sound using the "clapper" method.
- Demonstrate that sound waves cannot travel through a vacuum.
- Pupils will probably ask about shattering a glass with sound.
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
