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What is maximum ultrasound intensity of narrow beam transducer?

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What is maximum ultrasound intensity of narrow beam transducer?

(a) 15 mW/cm^2

(b) 20 mW/cm^2

(c) 25 mW/cm^2

(d) 30 mW/cm^2

I got this question during an internship interview.

Origin of the question is Oximeters topic in division Oximeters of Biomedical Instrumentation

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The correct answer is (c) 25 mW/cm^2

For explanation: The narrow beam transducer uses a single ultrasound transmitter/receiver piezo-electric crystal pair. The maximum ultrasound intensity is generally kept below 25 mW/cm^2. The typical transducer diameter is 25 mm. The narrow beam transducer is very sensitive and produces a good trigger signal for instantaneous heart rate determination.

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