# The radiation having maximum wavelength is:a.) Ultraviolet raysb.) Radio wavesc.) X-raysd.) Infra-red rays

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Hint: If we know the frequency, then from the relation between frequency and wavelength. We can find out the waves having the highest wavelength.

$\lambda =\dfrac{c}{f}$
Where $\lambda$ is the wavelength
$C$ Is the speed of light
$f$ Frequency