Explain the term decibel - Vidyadip

Question

Explain the term decibel

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Answer

The intensity level of a sound wave, by definition, is $\beta=\log _{10}\left(\frac{I}{I_0}\right)$ bels $=10 \log _{10}\left(\frac{I}{I_0}\right)$ decibels as one decibel is 0.1 bel. Here, $I_0$ (reference intensity) is taken as $10^{-12} W / m ^2$.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).]

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