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# HW1 - EE 119 Homework 1 Professor Jeff Bokor TA Xi Luo Due...

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EE 119 Homework 1 Professor: Jeff Bokor TA: Xi Luo Due Tuesday, Feb 2 nd 2010 (Please submit your answers in EE119 homework box located in 240 Cory Hall) 1. (a) Pat is a happy dolphin who grew up in Sea World. Today Uncle Lee, Pat’s trainer, is going to teach him a new trick to jump through a ring from underneath the water. Pat is below the water surface by a distance d2 and away from Uncle Lee horizontally by a distance L, and he sees Uncle Lee holding the ring above the water surface by a distance d1. Where should Pat aim? (Express your answer in terms of d1, d2, and L. Ignore the effect of gravity and assume Pat goes along a straight line. Small angle approximation can be used.) (b) After taking your advice and successfully demonstrating the new trick, Pat won applause from all the kids watching the show. After the show, he takes a break at the bottom of the pool. Looking straight up toward the smooth surface, Pat receives a cone of rays and sees a circle of light filled with the images of sky and birds and whatever else is up there. Can you explain what is happening and compute the cone-angle? (Take refractive index air=1, water=4/3) 2. (a) A student is studying a material with a work function of 2.4eV, and someone accidentally turns on a nearby 610nm, 1mW laser that hits the material. The student has a detector nearby that is very sensitive in detecting electrons. Does the detector detect any ejected electrons? What if the laser power was doubled to 2mW?

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HW1 - EE 119 Homework 1 Professor Jeff Bokor TA Xi Luo Due...

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