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

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Presentation on theme: "KS 3 laboratory Sound De Lisle Catholic Science College Science department."— Presentation transcript:

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

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

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

4 Vibrating wooden lath Air particles pushed together Energy flow Creating a sound wave 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 vibrationLoudness of sound Small movements Large movements Quiet Loud Speed of vibrationPitch of sound Slow Fast Low High Add values

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

8 Sound wave model Wavelength Amplitude Add variables

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

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

11 Speed of sound help triangle Distance SpeedTimeX m m/s s Speed = Distance Time Add variables Add units

12 Measuring the speed of sound 00 : Timer Sound waves travel 165m 00 : Calculation: Speed of sound= Distance Time = = 330m/s Sound waves Clappers Bang clappers together 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 Loud QuietSmall Large Add values

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

15 KS 3 laboratory De Lisle Catholic Science College Thank you for your visit to our virtual laboratory Exit


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