Answer
$f=2.39\times 10^7Hz$
Work Step by Step
The frequency required to achieve to resonance can be calculated from the formula:
$f=\frac{qB}{2\pi m_p}$
We plug in the known values in this formula to obtain:
$f=\frac{1.6\times 10^{-19}(1.57)}{2(3.1416)(1.67\times 10^{-127})}$
$f=2.39\times 10^7Hz$
