Which of the following is closest to the wavelength of red light in the visible spectrum?

• A. 700 nm
• B. 550 nm
• C. 400 nm
• D. 350 nm

Answer: (A)

Verified step by step guidance

1. Recall that the visible spectrum of light ranges approximately from 400 nm to 700 nm in wavelength, with violet light at the shorter wavelength end and red light at the longer wavelength end.
2. Identify the typical wavelength range for red light, which is roughly between 620 nm and 750 nm.
3. Compare the given options (550 nm, 400 nm, 350 nm) to the known range for red light.
4. Note that 550 nm corresponds to green light, 400 nm corresponds to violet light, and 350 nm is outside the visible spectrum (ultraviolet).
5. Conclude that the wavelength closest to red light among the options is the one near 700 nm, which matches the known range for red light.