Question

Which colour of the light has the longest wavelength?

• A. green
• B. violet
• C. red
• D. blue

Hint:

The order of colours in the visible light spectrum is violet, indigo, blue, green, yellow, orange, and red. 

Answer 1

The Correct Option is C

Red has the longest wavelength among the given options. Red has the longest and violet has the shortest wavelength, this can be determined from the acronym VIBGYOR.
For frequency, it is inverse.

Therefore, option C) Red is the correct choice.

Answer 2

The colour with the shortest wavelength in the visible light spectrum is violet, while the colour with the longest wavelength is red. 

• The order of colours in the visible light spectrum is violet, indigo, blue, green, yellow, orange, and red. 
• Red has the lowest frequency and the highest wavelength. 
• The visible light spectrum is a section of the electromagnetic spectrum visible to the human eye, with wavelengths from 380 to 700 nanometers.

Answer 3

The spectrum of visible light has seven colours - Violet, Indigo, Blue, Green, Yellow, Orange, and Red. The frequency of light is inversely proportional to its wavelength. Red light has the longest wavelength among the colors of the visible spectrum. The visible spectrum is the portion of the electromagnetic spectrum that can be seen by the human eye, and it encompasses the colors red, orange, yellow, green, blue, indigo, and violet. 

• The wavelength of visible light ranges from 400 nm (violet) to 700 nm (red). 
• Within this range, red light has the longest wavelength and violet light has the shortest.
• This is due to the different energies that different colors of light carry. 

Red light has a lower energy than the other colors of light, and as a result, its wavelength is longer.