Because the speed of light in vacuum (or air) has such a large value, it is very

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Because the speed of light in vacuum (or air) has such a large value, it is very difficult to measure directly. To measure this speed, you conduct an experiment in which you measure the amplitude of the electric field in a laser beam as you change the intensity of the beam. Figure P32.49 is a graph of the intensity I that you measured versus the square of the amplitude Emaxof the electric field. The best-fit straight line for your data has a slope of 1.33 × 10-3J/(V2ˆ™ s).

(a) Explain why the data points plotted this way lie close to a straight line.

(b) Use this graph to calculate the speed of light in air.


Figure P32.49

I (W/m²) 800 600 400 200 - Ema? (105 v²/m²) 800 6.00 2.00 4.00 6.00

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University Physics with Modern Physics

ISBN: 978-0133977981

14th edition

Authors: Hugh D. Young, Roger A. Freedman

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