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What amateur band are you using if you are transmitting on 223.50 MHz?
1.25 meter band

Exposition

A person could either memorize that the 1.25 meter band runs from 219 to 220 then again from 222 to 225, or a person could convert the frequency to a wavelength and pick the closest answer.

\lambda=\frac{c}{v} or \text{wavelength}=\frac{\text{speed of light}}{\text{frequency}}
\lambda=\frac{3*10^8}{223.5 MHz}
\lambda=\frac{300,000,000}{223,500,000}
\lambda=1.34

The 1.25 meter band is the closest given answer.

See alsoEdit

wavelength frequency conversion

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