(a) This peak in the intensity of scattered electrons is due to constructive interference between electron waves scattered by different surface atoms. Vaa = 54 V u = 50″ 15° 30″ 45″ 60° 75° 90″ If the scattered waves are in phase, there is a peak in the intensity of scattered electrons. (b) Incident waves in phase 50 d Atoms on surface of crystal k-

In an electron-diffraction experiment using an accelerating voltage of 54 V, an intensity maximum occurs for u = 50° (see Fig. ). X-ray diffraction indicates that the atomic spacing in the target is d = 2.18 * 10-10 m = 0.218 nm. The electrons have negligible kinetic energy before being accelerated. Find the electron wavelength.

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