Question

Light with the lowest frequency (longest wavelength) is:
(A) Blue
(B) Green
(C) Orange
(D) Red

Answer 1

Hint:With the increase in the frequency the perceived colour gradually changes from red to orange followed by yellow then green to blue and lastly violet. The lowest frequency of the visible light is the red colour which has least energy.

Complete step by step answer:
 sunlight which is also known as a white light is composed of seven different colours violet, Indigo, blue, green, yellow, orange and red commonly known as VIBGYOR. The wavelength of red light is the highest and that of violet light is the lowest. We know that wavelength is inversely proportional to the frequency therefore red light has the lowest frequency or at least energy whereas violet light has the maximum frequency or the maximum energy.

Therefore in the above provided options red light has the lowest frequency.

Additional information:
Splitting of light into its constituent seven colours is known as dispersion of light. We can observe this effect by passing white light through a prism. The white light perceived by our eyes consists of all the frequencies in the electromagnetic radiation present in the visible region.

Note:The frequency of red light is least and that of violet light is the most.The time period is the time taken by a complete cycle of the wave to pass a point, Frequency is the number of complete cycles of waves passing a point in unit time. Angular frequency is angular displacement of any element of the wave per unit time.