![]() The "decibel" is technically one tenth of the unit "bel," although the "bel" is rarely used. The bel is named in honor of Socttish-American scientist and inventor of the telephone, Alexander Graham Bell (1847-1927) 2. ![]() This is useful in medical ultrasound since the difference in intensity between a transmitted ultrasound beam and a returning echo can be six orders of magnitude different.
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