Final answer:
The smallest unit of light for any wavelength is known as a photon, which is a particle that carries a specific amount of energy based on its wavelength within the electromagnetic spectrum.
Step-by-step explanation:
The smallest amount of light of any given wavelength is a single photon.
A photon is the smallest divisible particle of light, essentially a minimum quantum packet of energy. Each photon has a well-defined energy, which is directly related to its wavelength or frequency. This means that different wavelengths of light will have photons carrying different amounts of energy. Visible light is just a small part of the electromagnetic spectrum which also includes other wavelengths such as radio waves, microwaves, infrared, ultraviolet, X-rays, and gamma rays. A typical household light bulb emits a staggering number of these photons every second, highlighting their fundamental role in the illumination we experience daily.