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The MRI in a hospital scans with 400 MHz. How much energy does it correspond to(in kJ/mol) ? |
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Answer» ,E = HC / λwhere c, the speed of light, is 2.998 x 10^8 m s–1.1 MHz = 0.001 ms400 MHz = 2.5 × 10^-6 ms = λh = plank's constant = 6.626 × 10^-34 j-s PUT the VALUES,E = (6.626 × 10^-34 × 2.998 x 10^8 ) / (2.5 × 10^-6) = 7.89 × 10^-20 kJ/mol (ANS) |
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