A cathode ray oscilloscope can be used to analyze sound waves by displaying the electrical signals produced by a microphone. It can compare waves with different amplitudes, showing that waves with a larger amplitude carry more energy and are produced by louder sounds. It can also compare waves with different frequencies, demonstrating that waves with peaks closer together have a higher frequency and pitch.

1. 8.3- Analysing Sound waves
Sir. Muhammad Abdul Mageid
Cambridge VIII
Physics – CHAPTER 8

2. Microphones and CRO
 A microphone : transfers sound energy into electrical
signals
 The electrical signals can be displayed on the screen
of a Cathode Ray Oscilloscope [ CRO]
 CRO : Used in analysing sound waves

3. Microphones and CRO

4. CRO ; Cathode Ray Oscilloscope
 CRO :
can compare
simple sound
waves with
different amplitudes

5. CRO ; Cathode Ray Oscilloscope
 The wave (B) was produced by a louder sound than the wave (A)
 The wave (B) has a larger amplitude than the wave (A)
 The wave (B) is carrying more energy than the wave (A)

6. CRO ; Cathode Ray Oscilloscope
 CRO : can compare simple sound waves with different
Frequencies

7. CRO ; Cathode Ray Oscilloscope
 The wave peaks in (B) are closer than that in wave (A)
 The wave (B) has a higher frequency than the wave (A)
 The wave (B) has a higher pitch than the wave (A)
Wave BWave A

8.  Which two waves have the same frequency ?
 Which two waves have the same amplitude ?
 Which of waves is being produced by the sound with the highest pitch ?
 Which represents the louder sound ?
Question : The diagram shows four sound waves displayed on a CRO
Answer The Following Question