The Michelson interferometer can be used to measure the index of refraction of a gas by placing an evacuated transparent tube in the light path along one arm of the device. Fringe shifts occur as the gas is slowly added to the tube. In this problem one fringe shift is defined to mean from a bright pattern to the next dark pattern and not bright to dark and back again to a bright, which would be two fringe shifts. These fringe shifts occur because the wavelength of the light changes inside the gas filled tube. Assume that 621 nm light is used, the tube is 4.63 cm long, and that 326 fringe shifts occur as the pressure of the gas in the tube increases to atmospheric pressure. Calculate ngas, the index of refraction of the gas.

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).

its a 5.5 n

glad that

there are no contact forces mentioned on the list of choices that you've provided.

you can cut your hand off if your not