(a) A circular diaphragm 50 cm in diameter oscillates at a frequency of 25 kHz as an underwater source of sound used for submarine detection, Far from the source, the sound intensity is distributed as the diffraction pattern of a circular hole whose diameter equals that of the diaphragm. Take the speed of sound in water to be 1450 m // s and find the angle between the normal to the diaphragm and a line from the diaphragm to the first minimum. (b) Is there such a minimum for a source having an (audible) frequency of 1.0 kHz?

(a) A circular diaphragm 50 cm in diameter oscillates at a frequenc

1.	(a) A circular diaphragm 50 cm in diameter oscillates at a frequency of 25 kHz as an underwater source of sound used for submarine detection, Far from the source, the sound intensity is distributed as the diffraction pattern of a circular hole whose diameter equals that of the diaphragm. Take the speed of sound in water to be 1450 m // s and find the angle between the normal to the diaphragm and a line from the diaphragm to the first minimum. (b) Is there such a minimum for a source having an (audible) frequency of 1.0 kHz?
Answer» SOLUTION :(a) 8.1, (b) SINCE `SIN theta` cannot exceed 1 there is no minimum

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