Associate Safety Professional Practice Exam

The wavelength of the visible region of the electromagnetic spectrum ranges from what values?

1. 300 to 600 nanometers

2. 400 to 780 nanometers

3. 500 to 900 nanometers

4. 600 to 1000 nanometers

The correct answer is: 400 to 780 nanometers

The correct answer is based on the widely accepted range of wavelengths that define the visible region of the electromagnetic spectrum. This region allows human eyes to perceive light, which is crucial for various applications, including lighting, photography, and safety equipment that relies on visible signals. Wavelengths in the visible spectrum range from approximately 400 nanometers (violet) to about 780 nanometers (red). This range encompasses all the colors that humans can see, with shorter wavelengths corresponding to blue and violet light, while longer wavelengths correspond to red light. Understanding this range is essential for professionals in safety and health, as it informs them about light sources and their potential effects on visibility and color recognition in various environments. The other ranges mentioned fall outside of what is conventionally recognized as the visible spectrum. For instance, the lower and higher ranges include ultraviolet and infrared wavelengths, which are not visible to the human eye.