Fundamental constants: e 1.60 x 1019 c - elementary charge me 9.11 x 1031 kg - electron mass 1. the intrinsic concentration of charge carriers in crystalline germanium is 2.0 x 1019 m3. the mobility of electrons is ue = 0.39 m2/(v s) 0.19 m2/(v s). ni and the mobility of "holes" is h (a) estimate the relaxation time t for electrons in crystalline germanium. (b) calculate the electric conductivity of crystalline germanium. (c) calculate the resistance r of a cylindric rod made of crystalline ger- manium that has diameter d = 5 mm and length 20 mm.

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?