Question

1. identify the region of the em spectrum that humans can see. explain why we can only see this small portion of the entire spectrum.

Explanation:

The visible light region of the electromagnetic (EM) spectrum is what humans can see. Our eyes' photoreceptor cells (rods and cones) have evolved to detect photons within the visible wavelength range (approximately 400 - 700 nm). Other EM spectrum regions (like UV, infrared, etc.) have photon energies or wavelengths that don't interact with our eye's receptors, so we can't perceive them.

Answer:

The region of the EM spectrum humans can see is the visible light region (wavelengths ~400 - 700 nm). We see only this small portion because our eye's photoreceptor cells (rods, cones) are adapted to detect photons in this wavelength range; other EM spectrum regions (e.g., UV, IR, X - rays) have photon energies/wavelengths that don't stimulate these receptors.