= Solution
The <RF harmonic number> is the number of RF cycles per revolution, so $f_{\rm RF}=h f_{\rm rev}$. For $h=32$,
$$
\boxed{f_{\rm RF}(4\,\mathrm{GeV})\simeq6.97217\,\mathrm{MHz},\qquad f_{\rm RF}(50\,\mathrm{GeV})\simeq7.10033\,\mathrm{MHz}.}
$$
The synchronous phase fixes which phase of that voltage is sampled, not the frequency ratio. For a sine voltage, $\varphi_s=0$ gives zero net accelerating voltage and describes a stationary ideal-energy condition; an actual energy ramp requires a phase producing the required energy gain. A different phase-origin convention changes that statement about the zero of phase, but not the boxed frequencies.
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