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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.

Syllabus
First assessment 2019
Course
Physics 4PH1

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.

Edexcel IGCSE Physics 3 26p Oscilloscope and Microphone Questions question 1

[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.

Figure for Question Edexcel IGCSE Physics 3 26p Oscilloscope and Microphone Questions question 1 — Edexcel IGCSE Physics

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

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