What is one common use of ultraviolet light in everyday life?

• A. Calculating distances
• B. Inducing skin tanning in tanning beds
• C. Heating food in microwaves
• D. Providing illumination for cameras

Answer: (B)

Ultraviolet (UV) light is commonly used in tanning beds to induce skin tanning. This is because UV radiation stimulates the production of melanin in the skin, resulting in a darker complexion. Tanning beds emit UV rays to replicate the natural sunlight that causes tanning. The specific wavelengths of UV light used in these devices are generally UVA and UVB, which penetrate the skin to induce a tanning response. This usage is well-known, particularly among individuals seeking a tanned appearance without prolonged sun exposure.

Other options, while also relevant in different contexts, do not relate to common uses of UV light in the same manner. For instance, calculating distances typically involves techniques related to laser or radio waves, not UV light. Heating food is specifically associated with microwaves that utilize a different part of the electromagnetic spectrum. Regarding camera illumination, visible light or flash technology is more prevalent than UV, which is not typically used for everyday photography due to its potential harmful effects on the skin and eyes.