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The transmitting crystal emits 40° divergent beam so that the beam covers an area of approximately _____ cm diameter.

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The transmitting crystal emits 40° divergent beam so that the beam covers an area of approximately _____ cm diameter.

(a) 10

(b) 20

(c) 30

(d) 40

I had been asked this question in an interview for job.

This question is from Oximeters topic in division Oximeters of Biomedical Instrumentation

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Correct option is (a) 10

The explanation is: An alternative arrangement is the array transducer which has one transmitter and six peripheral ceramic receiving crystals. The transmitting crystal emits a 40° divergent beam so that at 10 cm from the skin surface the beam covers an area of approximately 10 cm diameter.

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