A student is investigating two electromagnetic waves, $X$ and $Y$, in a vacuum.
Wave $X$ has a wavelength of $5.2 × 10^{–7} m$. Wave Y has a frequency of $9.4GHz$.
Which principal regions of the electromagnetic spectrum contain waves $X$ and $Y$?

1 )
A
2 )
B
C
4 )
D
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