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"When an electron beam strikes a block of copper, x-rays with a frequency of 2.0 x 10^18 Hz are emitted. What is the wavelength (in picometers) of these x-rays?" I got an answer of 150 pm but the back of the book says 150 nm. I'm pretty sure this is just a typo, especially since the question explicitly states to answer in picometers but the answer given is in nanometers, so I was just wondering if anyone can confirm if this is indeed a typo?
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