1. De Lisle Catholic Science College
KS 3 laboratory
Sound
De Lisle Catholic Science College
Science department

2. Virtual laboratory: Sound menu
What is sound
Sound variables
Sound
wave models
Speed of sound

3. Sound introduction Answers What is sound? sound is energy
How does sound travel?
sound travels in the form of waves
How are sound waves made?
sound waves are made by vibrating objects
What sort of things make sound waves when they vibrate?
musical instruments, bees wings, vocal cords, loudspeakers

4. Use mouse wheel or curser keys to animate
Creating a sound wave
Vibrating wooden lath
Air particles pushed together
Energy flow
Vibrating wooden lath
Air particles pulled apart
Energy flow
Use mouse wheel or curser keys to animate

5. Particle vibration in a sound wave
Direction of particle movement
Direction of energy transfer
Use mouse wheel or curser keys to animate

6. Sound variables Amount of vibration Loudness of sound Small movements
Large movements
Quiet
Loud
Add values
Speed of vibration
Pitch of sound
Slow
Fast
Low
High

7. Units for sound variables
Answers
Loudness (or volume)
decibel (dB)
The loudest human voice is 112dB
Frequency (or pitch)
hertz (Hz)
A sound frequency of 20Hz is twenty waves per second: a low rumble
A sound frequency of Hz is heard as a high pitched squeak

8. Sound wave model Wavelength Amplitude
Add variables

9. Quiet sound (low volume) Loud sound (high volume)
Quiet and loud sounds
High amplitude
Low amplitude
Change loudness
Quiet sound (low volume)
Add values
Loud sound (high volume)

10. Low and high frequency sounds
Wavelength
Wavelength
Add variables and values
Change frequency
Time = 0.1s
Time = 0.1s
Low frequency sound (20Hz)
Higher frequency sound (50Hz)

11. Speed of sound help trianglem
Add units
m/s
Distance
Speed
Time X
Add variables s
Speed = Distance
Time

12. Measuring the speed of sound
Sound waves
00:00.50
00:00.00
Clappers
Bang clappers together
Sound waves travel 165m
Timer
Calculation:
Speed of sound = Distance Time =
0.5
= m/s
Do calculation

13. Vocal cords – changing voice loudness
Volume of air blown over cords
Amount of vocal cord movement
Loudness of sound produced
Small
Large
Small
Quiet
Loud
Large
Add values

14. Vocal cords – changing voice pitch
Condition of vocal cords
Speed of vibration
Pitch of sound produced
More tight
Less tight
Faster
Higher
Slower
Lower
Add values

15. De Lisle Catholic Science College
KS 3 laboratory
De Lisle Catholic Science College
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