Problem 25.45 The photon energies used in different types of medical x-ray imagi

Question

Problem 25.45 The photon energies used in different types of medical x-ray imaging vary widely, depending upon the application. Single dental x rays use photons with energies of about 25{ m keV} . The energies used for x-ray microtomography, a process that allows repeated imaging in single planes at varying depths within the sample, is 2.5 times greater. Part A What are the wavelengths of the x rays used for these two purposes? Express your answer using two significant figures. lambda_{ m dental} = { m m} SubmitMy AnswersGive Up Part B Express your answer using two significant figures. lambda_{ m microtomography} = { m m} SubmitMy AnswersGive Up

Explanation / Answer

E1 = 25 keV = 25 * 10^3 * 1.6 * 10^ -19 = 4 * 10^-15 J

E2 = 2.5E1 = 10^-14 J

1 = hc/E1 = (1.98 * 10^-25)/(4 * 10^-15) = 4.95 * 10^-11

2 = hc/E2 = 1.98 * 10^-11 m

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