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    Question

    A decibel is –

    A A decibel is – Correct Answer Incorrect Answer
    B The wavelength of noise Correct Answer Incorrect Answer
    C A musical note Correct Answer Incorrect Answer
    D A measure of sound level Correct Answer Incorrect Answer

    Solution

    The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.

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