Assuming the target reflects 10% of the incident power, the working frequency of an ultrasound range...

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Assuming the target reflects 10% of the incident power, the working frequency of an ultrasound range finder system with transmitter power 1.5kW and receiver sensitivity 0.15mW operating in medium of attenuation coefficient a=0.25DB MHz'm 1 and maximum range of 90m is approximately: Select one: a. 1.33MHZ Б. 1.53МНZ c. 1.90MHZ d. 1.17MHZ е. 1.83МНZ Assuming the target reflects 10% of the incident power, the working frequency of an ultrasound range finder system with transmitter power 1.5kW and receiver sensitivity 0.15mW operating in medium of attenuation coefficient a=0.25DB MHz'm 1 and maximum range of 90m is approximately: Select one: a. 1.33MHZ Б. 1.53МНZ c. 1.90MHZ d. 1.17MHZ е. 1.83МНZ