Out of the standard primary and secondary colours, it is only orange that is a fruit aswell?
For example you get apple which is a shade of green but green (nor purple, blue, yellow or red) are actually fruits are they? Just checking for a quiz, it's a simple question but there might be some exotic rare fruit called a blue etc etc . . .
In terms of the visible spectrum, "brown" refers to high wavelength (low frequency) hues, yellow, orange, or red, in combination with low luminance or saturation.[4] Since brown may cover a wide range of the visible spectrum, composite adjectives are used such as red brown, yellowish brown, dark brown or light brown.
Extension Physics does that cover string or should I say elastic theory?