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A material whose K -absorption edge is 0...

A material whose `K` -absorption edge is `0.2 Å` is irradiated by X-ray of wavelength `3644 Å` , find the maximum energy of the photoelectrons that are emitted from the `K` shell.

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`1.5xx10^(6)J//s=1.5xx1^(6)W`
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