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An electron drops from the l shell to the k shell and gives

1. An electron drops from the L shell to the K shell and gives off an X-ray with a wavelength of 0.0205 nm. What is the atomic number of this atom?

2. A radioactive substance has a decay constant equal to 8.9x10^-3s-1. What is the half-life of this substance?

3. How many rad of 200-keV X-rays cause the same amount of biological damage as 50 rad of heavy ions? Explain please.

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Physics: An electron drops from the l shell to the k shell and gives

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