Topic: Electromagnetic spectrum and applications· Electromagnetic Waves

Which colour of the light has the longest wavelength ?

1. red

2. blue

3. green

4. violet

Doubtly Asked 30 Oct 2026 NEET UG 2019 neet Save WhatsApp Report

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Answer: 1. red

In the visible spectrum wavelength decreases from red to violet (about 700 nm for red, 400 nm for violet). So red has the longest wavelength among the given colours.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which colour of the light has the longest wavelength ?

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