State the typical range of frequencies of sound that a healthy human ear can detect.
An engineer uses an oscilloscope to test the sound output from an acoustic alert system.
Name the piece of apparatus that must be connected to the oscilloscope to detect the sound wave and convert it into an electrical signal.
Describe how the engineer should use the oscilloscope to determine the frequency of the sound wave.
The engineer obtains the trace shown on the grid below.
Describe how the trace on the grid would change if the acoustic alert system plays a sound that is quieter and has double the frequency of the original sound. Reference specific grid division measurements in your answer.
