Physics
The wavelength range of white light is:
- 4000 nm to 8000 nm
- 40 nm to 80 nm
- 400 nm to 800 nm
- 4 nm to 8 nm
Spectrum
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Answer
400 nm to 800 nm
Reason — As we know, the wavelength of violet colour is 400 nm and that of red colour is 800 nm. Hence, the wavelength range of white light is 400 nm to 800 nm.
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Related Questions
When a white light ray falls on a prism, the ray at its first surface suffers —
- no refraction
- only dispersion
- only deviation
- both deviation and dispersion
When a ray of white light falls on a prism, which of the following statements are correct ?
- The dispersion of white light occurs at the first surface of the prism.
- The deviation of light rays occurs at both the surfaces of the prism.
- The prism does not produce colours, but it only splits the various colours present in the white light.
- All of the above.
The correct arrangement of colours in an increasing order of their wavelengths is :
- Violet < Green < Red
- Red < Green < Violet
- Green < Violet < Red
- Green < Red < Violet
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of a prism is —
- violet
- yellow
- red
- blue