A micro-wave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)
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(a)$n = \frac{v}{\lambda } \propto v$==> $\frac{{{n_{MW}}}}{{{n_{US}}}} \approx \frac{{3 \times {{10}^8}}}{{3 \times {{10}^2}}} \approx {10^6}:1$
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