AP® Physics 1 & 2

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X-Ray Interference Pattern


Students are experimenting with low energy x-rays that carry a quantum energy of $124\text{ eV}$. They have a diffraction grating with a spacing of $2000$ lines per centimeter.

No interference pattern is observed. They are stumped and ask advice.

"Created for Albert.io. Copyright 2016. All rights reserved.”

What change could you suggest to solve their dilemma?


Make the room darker, the light in the room is masking the pattern of the x rays.


Use a diffraction grating with a spacing that has more lines per centimeter.


Increase the intensity of the x-rays to make the pattern more prominent.


Move the receiver closer to the grating to allow distance for the intensity of the beam to decrease according to the inverse square law of light intensity.