Electromagnetic Waves - Result Question 20

20. Which colour of the light has the longest wavelength?

[2019]

(a) red

(b) blue

(c) green

(d) violet

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Answer:

Correct Answer: 20. (a)

Solution:

  1. (a) $\lambda _{\text{Red }}>\lambda _{\text{Green }}>\lambda _{\text{Blue }}>\lambda _{\text{Violet. }}$ Red has the longest wavelength.