Wo slits separated by a distance of d = 0.155 mm are located at a distance of d = 2.40 m from a screen. the screen is oriented parallel to the plane of the slits. the slits are illuminated by a monochromatic and coherent light source with a wavelength of λ = 538 nm. a wave from each slit propagates to the screen. the interference pattern shows a peak at the center of the screen (m=0) and then alternating minima and maxima.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]