For a 5 MHz ultrasound beam, what is the total attenuation of the echoes received at the transducer from a target 5 cm deep, if the target reflects 50% of the ultrasound energy? Assume an attenuation rate of 1 dB/(cmMHz)   a. 48 dB b. 53 dB c. 100 dB d. 200 dB

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