Fig. 1.1 shows the waveforms of two sounds, M and N, displayed on the same CRO with identical settings. Compared to sound M, sound N has the same frequency ...
Question 1 Report
Fig. 1.1 shows the waveforms of two sounds, M and N, displayed on the same CRO with identical settings.
Compared to sound M, sound N has the same frequency and the same amplitude. What is the same about the two sounds?
Answer Details
Frequency and amplitude are the two wave properties that determine the perceived pitch and loudness of a sound respectively: frequency determines pitch, and amplitude determines loudness.
Since sound N is stated to have the same frequency and the same amplitude as sound M, both of the properties that determine how a sound is perceived by ear are identical between the two.
So sound N has the same pitch and the same loudness as sound M. Although the two waveforms could in principle still differ in more subtle ways (such as the mixture of overtones present, which affects tone quality or timbre), for the properties directly linked to frequency and amplitude at this level, pitch and loudness are the two quantities that must match.
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