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A medium attenuates ultrasound at a rate of 0.7dB cm-1 MHz-1. A target at a depth...

A medium attenuates ultrasound at a rate of 0.7dB cm-1 MHz-1. A target at a depth of 5 cm below the transducer is imaged with a 3 MHz ultrasound pulse. By how many dB will the echo from the target be attenuated compared to a similar target at a depth of 1 cm?

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