Which one of these statements about Black Body radiation is FALSE? 0 A black body may re-radiate energy at different wavelengths from the absorbed wavelengths 0 Black body radiation has a peak in the emission spectrum which is not temperature dependent. O A perfect black body re-radiates all energy which it absorbs O A perfect black body is a perfect absorber of all wavelengths of radiation A wave on a string has an equation x = (0.15 metres) cos (5x-25t) . Assuming all values are in the appropriate SI units, what is the speed of this wave? O 2 m/s O 5.0 m/s O 7.0 m/s O 18 m/s O 35 m/s