Question

question 1
a scientist is studying a mysterious electromagnetic wave with a wavelength of 500 nanometers. based on the electromagnetic spectrum, what conclusion can the scientist draw about this wave?
it is an ultraviolet wave that can damage skin
it is an infrared wave associated with thermal energy
it is visible light in the blue - green region of the spectrum
it is a microwave used in cell phone communication

Explanation:

1. Recall the electromagnetic spectrum: Visible light ranges from ~400 - 700 nm. 500 nm falls in this range.
2. Analyze each option:

• Ultraviolet (UV) is ~10 - 400 nm, so 500 nm is not UV. Eliminate first option.
• Infrared (IR) is >700 nm (up to ~1 mm), so 500 nm is not IR. Eliminate second option.
• Microwaves are >1 mm (up to ~1 m), so 500 nm is not a microwave. Eliminate fourth option.
• 500 nm is in the visible light range, specifically the blue - green region (since blue is ~450 - 500 nm, green ~500 - 550 nm). So the third option is correct.

Answer:

C. It is visible light in the blue - green region of the spectrum