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The properties of sound are relatable to those of a wave The basic properties of sound are:  Pitch Loudness Tone

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Pitch: the frequency of sound. Higher frequency sound=Higher pitch Lower frequency sound=Lower pitch Frequency of 20 to 20 000 Hz is  audiible  to the human ear. Infrasound: frequency below 20 Hz Ultrasound: frequency above 20 000 Hz

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Diagram

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Loudness is determined by the amplitude of sound. Large amplitude=Louder sound Smaller amplitude=Softer sound The vibration of the source sets the amplitude of the wave. Energy is transmitted into a medium through the vibrations. More energy=Larger amplitude Molecules move back and forth vigorously.

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Loudness is also determined by sensitivity of the ear. The human ear is only sensitive to some frequencies. The volume received depends on the amplitude of the sound wave and its frequency of the wave.

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EXERCISE 10 – 1 Study the following diagram representing a musical note. Redraw the diagram for a note: With a higher pitch That is louder That is softer

CHARACTERISTICS OF SOUND WAVES

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