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Magnetic resonance imaging, or MRI (see Section 21.7), and positron emission tomography, or PET scanning (see...

Magnetic resonance imaging, or MRI (see Section 21.7), and positron emission tomography, or PET scanning (see Section 32.6), are two medical diagnostic techniques. Both employ electromagnetic waves. For these waves, find the ratio of the MRI wavelength (frequency = 6.41 × 107 Hz) to the PET scanning wavelength (frequency = 1.28 × 1020 Hz).

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