Answer
$$1.5 \ MHz.$$
Work Step by Step
Since 1 KHz =$10^{3}$ Hz and 1 MHz = $10^{6} $ Hz, then 1 KHz =$10^{-3}$ MHz. So we have
$$1500 \ KHz= 1500\times 10^{-3} \ MHz=1.5 \ MHz.$$
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