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## Homework Statement

If protons with magnetic moment

**mu**in the z direction are in a strong magnetic field of magnitude

**B**in the z direction, what is the frequency

**f**of radiation that will be absorbed by the proton as it transitions from parallel to antiparallel states?

Express your answer in terms of

**mu**,

**B**, and Planck's constant

**h**.

## Homework Equations

## The Attempt at a Solution

E = mu * B

h*f= mu * B

f = (mu * B)h

but I got wrong..

the feedback says that my answer is off by multiplicative factor..

please help me..

thanks..