# physics

In a dentist's office, an X-ray of a tooth is taken using X-rays that have a frequency of 7.01 1018 Hz. What is the wavelength in vacuum of these X-rays?

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1. period = 1/frequency = (1/7.01)*10^-18

wavelength = 3*10^8 (1/7.01)*10^-18

= .428 * 19^-10
= 4.28 * 10^-11 meters

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