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A pair of speakers separated by 0.700 meter are driven by the same oscillator at a frequency of 675 Hz. An observer, originally positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the speakers.(Assume the speed of sound is 345 m/s.)
(a) Estimate how far must the observer walk before reaching a relative maximum in intensity?
m
(b) Estimate how far will the observer be from the speaker when the first relative minimum is detected in the intensity?
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Helium-neon laser light of wavelength 1004.5 nm is sent through a 0.473 mm wide single slit. What is the width of the central maximum on a screen 1.58 m from the slit? Answer in units of mm
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