Example_of_Pre-lab-reports

Example_of_Pre-lab-reports - that the light will travel and...

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Pre-Lab Report for Physics 331 There is a pre-lab-report for each lab, except speed of light. You must submit at least 5 pre-lab reports. The pre-lab report will be limited to one page. The three questions you need to address are: 1. What is the general purpose of lab? (2 points) 2. What are the quantities you will directly measure and how do you measure them? (5 points) 3. What are the quantities you will derive from the measurement and what are the formulas you will use? (3 points) Example of Pre-Lab-Report Speed of Light Date: Month/Date/Year; Name: XXXXX 1. What is the general purpose of lab? (2 points) The purpose of this experiment is to measure the speed of light using the time-of-flight method. 2. What are the quantities you will directly measure and how do you measure them? (5 points) In order to get the speed of light, we need to know two quantities, L and t . Here, L is the distance
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Unformatted text preview: that the light will travel and t is the time for light to travel. The light is emitted by a pulsed laser and then bounced back by a mirror to the detector. L can be measured by a tape measure from pulsed laser → mirror → detector. The time t is measured by an oscilloscope. When laser pulse is emitted by the pulsed laser, there is a trigger signal sent to the oscilloscope simultaneously. The returned pulse will be picked up by the detector and displayed by the oscilloscope. We can read out the time t directly from the oscilloscope. 3. What are the quantities you will derive from the measurement and what are the formulas you will use? (3 points) We will derive the light speed c . When light travels a distance L in time t the speed c = L / t . For a good measurement, we will measure a few pairs of ( L , t ) and plot them. The slope should be related to the speed of light....
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This note was uploaded on 01/20/2012 for the course PHYSICS 331 taught by Professor Wiaodongxu during the Fall '11 term at University of Washington.

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