The document discusses key concepts related to sound including frequency, amplitude, volume, pitch, noise pollution, the medium sound travels through, and how sound is measured. It notes that sound is caused by vibrations that travel in waves at different speeds depending on the medium, and that the human hearing range is typically 20 Hz to 20,000 Hz.

1. Sound Target To draw a concept map for the topic Friday 5 June 2009

2. Sound Frequency Amplitude Volume Loud sound Quiet sound High pitch Low pitch Hertz Decibels Human range is 20 Hz to 20000Hz Noise pollution Unwanted sound Vacuum Solids Gases Vibrations Speed of sound About 300 metres per second Caused by But cannot be heard in a Waves per second is- Many waves Few waves Shown by Measured in Fastest in In air speed is Too much is is in Slowest in