Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store
seo-qna
SearchIcon
banner

The wavelength of red light is ______ times greater than that of blue light.
A) 1.8
B) 18
C) 0.18
D) 18

Answer
VerifiedVerified
514.8k+ views
1 likes
like imagedislike image
Hint: To solve this question first we need to know the wavelength for the red light and blue light then we will find the ratio of their wavelengths and in final we can conclude the wavelength of red light how many times of the wavelength of blue light.

Complete answer:
The visible light consists of seven colours. The wavelength of the visible light is in the range of 340 nanometre to 740 nanometres.
The visible white beam of light is made up of seven colours. These seven colours of the light get separated after passing through the prism. This phenomenon is known as the dispersion of light.
The wavelength of red light is 700 nanometres
The wavelength of blue light is 400 nanometres
Given:
Wavelength of red light, λr=700 nm
Wavelength of blue light, λb=400 nm
Taking ratio of both the wavelengths:
λrλb=700400 
λrλb=1.75
λrλb1.8
The wavelength of red light is 1.8 times greater than that of blue light.
Hence, Option (A) is correct.

Note: The red colour in the visible range has maximum wavelength. The violet colour of the light has minimum wavelength. The visible light wavelength varies from violet to red colour.
Latest Vedantu courses for you
Grade 10 | MAHARASHTRABOARD | SCHOOL | English
Vedantu 10 Maharashtra Pro Lite (2025-26)
calendar iconAcademic year 2025-26
language iconENGLISH
book iconUnlimited access till final school exam
tick
School Full course for MAHARASHTRABOARD students
PhysicsPhysics
BiologyBiology
ChemistryChemistry
MathsMaths
₹36,600 (9% Off)
₹33,300 per year
Select and buy