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At what angle divergent beam is transmitted by a crystal in array transducer?

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At what angle divergent beam is transmitted by a crystal in array transducer?

(a) 10°

(b) 20°

(c) 30°

(d) 40°

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Right answer is (d) 40°

The explanation: 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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