spectruma range of related qualities, ideas, or wavelengths of electromagnetic radiationThe visible spectrum of light ranges from red wavelengths to violet wavelengths.NoteThe visible spectrum of light ranges from red wavelengths to violet wavelengths.Elon.io is an online learning platformWe have an entire course teaching IELTS Vocabulary — Band 7+ grammar and vocabulary.Start learning IELTS Vocabulary — Band 7+ now