Question

Wavelength of green light is
A) 400-450 nm
B) 500-550 nm
C) 660-720 nm
D) 720-800 nm

Answer 1

Hint: The wavelength of green light is about one-billionth of a meter.

Complete Answer:
- The human eye perceives colour ranging from around 400 nanometers to 700 nanometers over wavelengths.
- Light from 400–700 nanometers (nm) is named as visible light, or visible spectrum because it is visible to human beings. Other species can see light outside of this range but cannot be seen by the human eye.
- Colors of light corresponding to narrow bands of wavelengths (monochromatic light) are the pure spectral colours identified using the acronym ROYGBIV i.e., red, orange, yellow, green , blue , indigo, and purple.
- Some people can see better than others in the ultraviolet and infrared ranges, but the boundaries of red and violet "visible light" are not well described.

Now, let us find the solution from the options-
1) Green has a primary wavelength of 495–570 nm approximately.
Green light's wavelength is around 550 nanometers (one-billionth of a metre).
In photosynthesis much green light is useful.
Green light is the light in the visible spectrum which is least commonly used.
2) 400-450 nm is the wavelength of violet colour.
3) 660-720 nm is the wavelength of orange colour.
4) 720- 800 nm is the wavelength of red colour.

Thus, the correct answer is option (B) 500-550 nm.

Note: Green is the colour of the visible spectrum, between blue and yellow. Violet light has the shortest wavelength meaning it has the maximum energy and frequency. Red has the longest wavelength which means the smallest frequency and energy.