(a) A circular diaphragm 64 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 nd the angle between the normal to the diaphragm and a line from the diaphragm to the rst minimum. (b) Is there such a minimum for a source having an (audible) frequency of 1.0 kHz? (a) Number n Units v (b) V Current Attempt in Progress If, in a two-slit interference pattern, there are 9 bright fringes within the first side peak of the diffraction envelope and diffraction minima coincide with two-slit interference maxima, then what is the ratio of slit separation to slit width? Number Units e Textbook and MediaCurrent Attempt in Progress If we increase the slit width, what happens to the width of the central maximum in the diffraction pattern? 0 decreases 0 remains the same 0 increases eTextbook and Media