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What minimum accelerating voltage is required to produce an $\mathrm{x}$ -ray with a wavelength of 70.0 $\mathrm{pm}$ ?

1.78 \times 10^{4} V

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Numerade Educator

Hope College

University of Sheffield

McMaster University

can this problem? We're gonna get the voltage required to produce a wavelength of 70 p. Commuters. 70 point Opie commuters. Um, so that's gonna be PICO meters is 10 to the minus 12. So we want to use our general, um, photo electric effect formula in terms of the stopping voltage. And so that's gonna be e V equals the energy of a proton minus the work function. Let's say that the work function goes to zero if we're especially if we're trying to find the minimum accelerating voltage so you can get, um, voltages e biggie over little E. And then he is equal to HC over Lambda. So it's HD over Lambda Times E. And then I'm gonna go ahead and put that into a calculator. Um and so so 70 times seven minus 12. Some of that I got 17 1007 100 quilt

University of Washington