Which visible light color has the longest wavelength? By Rabia Anum 🌐 Source Physics Knowledge Base ✅ Fact Checked 📊 Difficulty Medium 📅 Last Updated 13 Aug 2026 A. Blue B. Green C. Red D. Violet Check Answer 💡 Explanation: Red light has the longest wavelength and lowest frequency in the visible spectrum. 📚 Topics: Physics Science 🎯 Exams: CSS GEN NTS PMS