Saved Bookmarks
| 1. |
Explain the term decibel |
|
Answer» The intensity level of a sound wave, by definition, is β = log10 \((\frac I{I_O})\) bels = 10 log10 \((\frac I{I_O})\) decibels as one decibel is 0.1 bel. Here, IO (reference intensity) is taken as 10-12 W/m2. Intensity level is expressed in decibel (dB). There is no direct relation between loudness and intensity. The decibel is not a unit of loudness. [Note : The decibel, equal to 0.1 bel, is used for comparing two power levels, currents or voltages. The unit bel is named in honour of Alexander Graham Bell (1847-1922) BritishAmerican scientist, inventor of the telephone (1876).] A decibel (dB) is a unit that is used to measure the power or intensity of an electrical signal or audible sound. |
|