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PHYS153assign1a_solution

PHYS153assign1a_solution - Don’s Boot Camp for Midterm 1...

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Don’s Boot Camp for Midterm 1 These are problems to help you prepare for midterm 1 1. The amplification or gain of a transistor amplifier may depend on the temperature. The gain for a certain amplifier at room temperature ( 20 . 0 C ) is 30.0, where as at 55 . 0 C it is 35.2. What would be the gain at 30 . 0 C if the gains depends linearly, over a limited range? 2. To measure temperatures, physicists and astronomers often use the variation of intensity of electromagnetic radiation emitted by an object. The wavelength λ max at which the intensity is greatest is given by the equation λ max T = 0.2898cm K, where T is the object temperature in Kelvins. In 1965, microwave radiation peaking at λ max = 0.107cm was discovered coming in all directions from space. To which temperature does this correspond? What was the 1978 Nobel Prize in Physics give for? What was the 2006 Nobel Prize in Physics give for? 3. In the interval between the freezing point of water and 700 . 0

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