In a display of fluorescent minerals, what type of light will enhance the display by causing them to emit visible light?

• A. Infrared light
• B. Visible light
• C. Ultraviolet light
• D. X-rays

Answer: (C)

Fluorescent minerals have the unique property of absorbing certain wavelengths of light and re-emitting them at a longer wavelength, which is typically in the visible spectrum. For many fluorescent minerals, ultraviolet light is particularly effective at stimulating this fluorescence. When these minerals are exposed to ultraviolet light, they absorb the energy and subsequently emit visible light, creating a vibrant display.

Ultraviolet light falls outside the visible spectrum, which means it's invisible to the human eye, but it has higher energy than visible light. This high energy is crucial for exciting the electrons in the minerals, allowing them to jump to higher energy levels. When the electrons return to their original state, they release energy in the form of visible light.

In contrast, infrared light lacks sufficient energy to excite the electrons in fluorescent minerals. Visible light, while it can illuminate the minerals, does not provide the specific energy input needed to induce fluorescence. X-rays, while high in energy, are typically used in applications like medical imaging and are not effective for enhancing the fluorescence of minerals.

Thus, ultraviolet light is the ideal choice to enhance the display of fluorescent minerals, leading to their characteristic glow.