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a) Demonstrate that a chemical shift range of 8.0 ppm corresponds to a frequency range of 480 Hz on a 60 MHz instrument. Explain what is the frequency range on a 270 MHz instrument?

(b) Explain what magnetic field strength must be applied for C-13 spin transitions to occur at 90 MHz? magnetogyric ratio for C-13 = 6.728x107 rad.T-1.s-1

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