What color of light has the highest frequency?

R O Y G B I V - that is how I was taught to remember the colors of the rainbow in order 🌈 red, orange, yellow, green, blue, indigo and violet

tetrahertz... yup

Dog Lady, you're right but the question is highest frequency not longest frequency...

Dog Lady, Richard Of York Gave Battle In Vain

that's why b.c there are no bbn tanning salons left!