<u>Answer:</u> The radiation has a frequency of
and is a type of radio wave.
<u>Explanation:</u>
The equation given by Planck's follows:

where,
E = energy of the light = 
h = Planck's constant = 
= frequency of light = ?
Putting values in above equation, we get:

The relation between frequency and wavelength is given as:

where,
c = the speed of light = 
= frequency of radiation = 
= wavelength of the radiation = ?
Putting values in above equation, we get:

The radiation having wavelength 0.677 m belongs to radio waves.
Hence, the radiation has a frequency of
and is a type of radio wave.