8. which of the following parts of the electromagnetic spectrum have longer wavelengths than those witnessed in the visible spectrum?

Here's my answer to your question. Hope it helps. Its shows the different wavelengths.

liquid crystals are matters in a state which have properties between those of conventional liquids and those of solid crystals[1]. liquid crystal is partially ordered and anisotropic. in terms of molecular order, liquid crystal molecules have one-dimensional or two-dimensional long - range order.