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What is the unit of dB?(a) watts per sq cm(b) dyne per sq cm(c) unit less(d) watts per cmI got this question in exam.Asked question is from Mechanism of Hearing in division Audiometry of Biomedical Instrumentation

Answer»

Correct CHOICE is (c) unit less

Best explanation: Since DB is merely a ratio, it is a dimensionless entity.Decibel expresses the logarithm of the ratio between two sound intensities, powers or sound pressures. Use of decibels as units for comparison of intensities help to avoid all mathematical calculations except ALGEBRAIC addition or subtraction of small numbers. The transmission efficiency of any medium like air, a HEARING aid or an amplifier is usually EXPRESSED in dB as a gain when the output is greater and as a loss, if less.



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