Physics, 16.04.2020 00:51 tishfaco5000
Consider the pattern of interference fringes seen on a distant screen, due to two slits separated by a distance d. Suppose that the two slits were replaced by 20 slits, with the same spacing d between adjacent slits. Of the following quantities, indicate whether each would increase, decrease, or stay the same.
a. The number of visible fringes. 1. Same
b. The width of each fringe. 2. Increases
c. The spacing between fringe peaks. 3. Decreases
d. The maximum brightness of each fringe.
Answers: 3
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Asteel tube (k=50 w/mk) of inner and outer diameter di = 20mm and do=26mm, respectively, is used to transfer heat from hot gases flowing over the tube (h-hot = 200w/m2k) to cold water flowing through the tube (h-cold = 8000 w/m2k). what is the cold-side overall heat transfer coefficient uc? to enhance heat transfer 16 straight fins of rectangular profile are installed longitudinally along the outer surface of the tube. the fins are equally spaced around the circumference of the tube, each having a thickness of 2mm and a length of 15mm. what is the corresponding overall heat transfer coefficient uc? *solve for uc in both cases*
Answers: 1
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