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The frequency of the ultrasound wave is $f=2脳{10}^{6}Hz$

Velocity of the wave travelling through Aluminium is v_aluminium=6420 m/s

Wavelength is defined as the distance between consecutive crests or troughs in a wave.

The formula to calculate the wavelength in terms of the velocity of the wave through the medium is given by $位=\frac{v_{aluminium}}{f}$

Substitute 2 MHz for f into the above formula to calculate the wavelength.

$$\begin{gathered} 位=\frac{6420m/s}{2脳{10}^{6}Hz} \\ =3.21脳{10}^{-3}m \end{gathered}$$

Therefore, the wavelength of a 2.0 MHz ultrasound wave traveling through aluminum is$3.21脳{10}^{-3}m$.

The electromagnetic waves travels at speed of light in vacuum=c= $3脳{10}^{8}m/s$

Substituting in the above formula to calculate the frequency.

$f=\frac{c}{位}$

Substitute $3.21脳{10}^{-3}m$for $位$and $3脳{10}^{8}m/s$for c into the above formula to calculate f.

$$\begin{gathered} f=\frac{3脳{10}^{8}m/s}{3.21脳{10}^{-3}m} \\ =9.35脳{10}^{10}Hz \end{gathered}$$

Therefore, the frequency of electromagnetic wave would have the same wavelength as the ultrasound wave is$9.35脳{10}^{10}Hz$.