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For an electron that interacts with visible light, which visible photon would give the most accurate (lowest error) measurement of momentum (or speed)?

blue
yellow
green
orange
violet

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Answer:

violet

Explanation:

When an electron interacts with visible light, energy is transferred from the photon to the electron.

The most accurate (lowest error) measurement of momentum (or speed) of an electron is obtained using a photon of high energy and low wavelength.

Violet light which lies at the high energy end of spectrum is most suitable.