Edexcel IGCSE Physics 3 26p Oscilloscope and Microphone Questions

Use microphone signals and oscilloscope settings to display a sound wave, measure its period and amplitude, or change the trace on screen.

Exam points

Identify a microphone as the transducer that detects sound for an oscilloscope.
Calculate a sound wave’s period from horizontal divisions and the timebase, expressing the result in seconds.
Calculate trace amplitude from vertical divisions and the voltage-per-division setting.
Decrease time per square to show fewer cycles; decrease volts per square to increase trace height.
Draw a sound-wave trace with the stated timebase, keeping each cycle to the required number of squares.
Identify time as the variable measured on the oscilloscope screen’s horizontal axis.

[Maximum number: 2]

This question is about sound.

A sound wave has a frequency of 500 Hz .

The diagram shows the screen of an oscilloscope.

The timebase of the oscilloscope is 0.50 ms per square.

Draw the trace on the oscilloscope screen when the sound wave is detected.

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