A graden filled with red and yellow petunias,which wavelengths of light are ?

Which wavelengths of light are... WHAT? You didn't finish the question. Still, I will attempt to help you with an answer.





Visible light has a range of 400 to 700 nanometers (nm). Flowers are a particular color because they reflect that color while absorbing the others, i.e. blue flowers reflect blue light. Yellow has a wavelength centered on 570 nm; red is centered on 650 nm. See first link below.





Flowers also often have untraviolet reflectivity in the area around the pistils and stamens. This wavelength is invisble to humans, but insects see it. It helps guide the insects to the nectar, and to polinate the flowers. See 2nd link.