To show a signal loss or gained strength, the scientist used the unit called decibel(dB)

A decibel value in, strictly speaking, it is a ratio b/w two values

A bel is named after Alexander Graham Bell

Remember: if the decibel value is negative then the signal lost its strength similarly if the decibel value is positive then the signal got amplified or strengthened

Decibels definition: decibel is a meter to express a ratio b/w two signals power ( and )

dB= deci-Bel

bel= A deci-bel (dB) is one-tenth of a bel Where is the output power and is the input power

#### Decibel measurement

Consider a signal is passed through an amplifier with power 10 w and received 20w power as output calculate whether it is gain or loss of signal strength  Consider a signal is passed through a transmission medium (cable) with power 20 w and received 10w power as output calculate whether it is gain or loss of signal strength  #### decibel levels chart

Units of sound intensity : the intensity of sound can be expressed as power per unit area(Watts/ )

#### Decibel scale and Amplitude ### Mohammed Anees

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