CBSE BoardEnglish MediumSTD 11 HumanitiesPsychologySensory, Attentional And Perceptual Processes3 Marks
Question
Explain the psychological dimensions of a sound wave.
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Answer
There are three psychological dimensions of sound, namely loudness, pitch and timbre.
Loudness of the sound is determined by its amplitude. Sound waves with large amplitude are perceived as loud, those with small amplitude are perceived as soft. Loudness is measured in decibels (d).
Pitch refers to highness or lowness of a sound. The seven notes used in Indian classical music represent a gradual increase in their pitch. Frequency determines the pitch of a sound wave. The higher the frequency, the higher will be the pitch. The range of hearing is generally 20Hz-20,000Hz.
Timbre refers to the nature of quality of a sound. For example, the sound of a car engine and a person talking differ with respect to quality or timbre. The timbre of a sound reflects the complexity of its sound waves.
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