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| Q. |
A decibel is – |
| A. | A musical instrument |
| B. | The wavelength of noise |
| C. | A musical note |
| D. | A measure of sound level |
| Answer» D. A measure of sound level | |
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Explanation: 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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