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प्रश्न
What is meant by the ‘loudness’ of a sound? How is it related to the intensity?
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उत्तर
Loudness is an aural sensation, i.e., a physiological rather than a physical phenomenon. It increases with intensity but the relation between the two is not linear, i.e., the ear does not recognize a sound, having twice the intensity of another, as twice as loud. In fact loudness (L) of a sound and its intensity (I) are related as L = k log (I/I0). Here I/I0 is the intensity level of the sound or the ratio between its intensity I and the zero of intensity or the threshold intensity I0 and k, a constant of proportionality depending upon the unit chosen.
संबंधित प्रश्न
Loudness is determined by the __________ of vibration.
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- wavelength
- frequency and
- amplitude
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Explain the following and illustrate your answer by drawing appropriate diagram:
Quality of a musical note.
The diagram below shows three ways in which the string of an instrument can vibrate.
(i) Which of the above diagrams shows the fundamental note?
(ii) Which has the frequency 4 times that of the fundamental?
(iii) State the ratio between the frequency of the first and second.
What does the intensity of sound depend upon?
