In the double-slit interference pattern for helium atoms (Figure 4.13), the beam of atoms had a kinetic energy of 0.020 eV. (a) What is the de Broglie wavelength of a helium atom with this kinetic energy? (b) Estimate the de Broglie wavelength of the atoms from the fringe spac- ing in Figure 4.13 and compare your estimate with the value obtained in part (a). The distance from the double slit to the scanning slit is 64 cm.

In the double-slit interference pattern for helium atoms (Figure 4.13), the beam of atoms had a kinetic energy of 0.020 eV. (a) What is the de Broglie wavelength of a helium atom with this kinetic energy? (b) Estimate the de Broglie wavelength of the atoms from the fringe spac- ing in Figure 4.13 and compare your estimate with the value obtained in part (a). The distance from the double slit to the scanning slit is 64 cm.

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Question

10 µm
Scanning slit position
FIGURE 4.13 Intensity pattern ob-
served for double-slit interference
with helium atoms. [Source: O. Car-
nal and J. Mylnek, Physical Review
Letters 66, 2689 (1991).]
Intensity

In the double-slit interference pattern for helium atoms
(Figure 4.13), the beam of atoms had a kinetic energy
of 0.020 eV. (a) What is the de Broglie wavelength of a
helium atom with this kinetic energy? (b) Estimate the
de Broglie wavelength of the atoms from the fringe spac-
ing in Figure 4.13 and compare your estimate with the
value obtained in part (a). The distance from the double
slit to the scanning slit is 64 cm.

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