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Advanced Placement (AP)

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What is the wavelength of a 4000- eV (4.0- keV ) X-ray?
Express your answer to two significant figures and include the appropriate units.

What is the wavelength of a 4000- eV (4.0- keV ) X-ray? Express your answer to two significant figures and include the appropriate units. class=

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Would appreciate the help please!

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Can someone help me with these?