Problem 5: As the film of a soap bubble thins, it becomes darker, because the path length difference for the reflected light becomes small when compared with the wavelength of the light and there is a phase shift upon reflection at the outer surface. In this problem, assume the wavelength of visible light is in the range 400 nm to 700 nm. If a soap bubble becomes dark when the path length difference is less than one fourth the wavelength, what is the thickest the soap film can be and appear dark at all visible wavelengths? Give your answer in nanometers.

5. The N pole faces of two cylindrical neodynium magnets having a radius of 0.5 cm and a length of 20 cm are brought together so that their faces are parallel and there is a small gap between them. The magnetic surface charge density on each pole face is 2 x 10° Cm's. (a) What is the force between the magnets in the limit in which the gap goes to zero? -Assume that the magnets are much longer than shown in the figure below, so that you only need to concern yourself with the repulsion between N and N. (b) What is the force between the magnets when they are separated by 0.5 m? At this separation you can approximate the four pole faces as point-charges.

I have tried this one multiple times and got the following answers: 1.24E13, 1.24E14, 2.84E27, 5.67E26. I can't get this practice problem correct. Thank you for your help

In an experiment you artificially cut in half (-50% reduction) the number of voltage gated sodium channels that are located on the membrane of the axon hillock. 1.) Which of the following is the most likely result of this experimental manipulation? A. Summation of more IPSPS would be required for an action potential to occur B. This change would have no effect on the value required to reach threshold C. Even with a very large number of summating EPSPS it would be impossible for an action potential to occur D. The value to reach threshold would be higher (more positive) making it less likely for an aetion potential to occur E. All of the above statements are FALSE The made-up drug Jeakyhoss degrades myelin resulting in myelin becoming more porous and therefore a poor insulator. 2.) Which of the following would NOT be an effect of leakykose? A. Propagation of the action potential would likely alow B. The action potential may degrade because it can't properly be regenerated C. The action…

HW #13

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