What you’ll learn3 learning objectivesChoose one objective for a focused lesson, or study the complete topic.7.4.1That all electromagnetic waves are transverse waves that travel with the• state that all electromagnetic waves are transverse waves that travel with the same speed c in free spaceSyllabus objective7.4.2The approximate range of wavelengths in free space of the principal regions• recall the approximate range of wavelengths in free space of the principal regions of the electromagnetic spectrum from radio waves to γ-raysSyllabus objective7.4.3That wavelengths in the range 400–700 nm in free space are visible to the• recall that wavelengths in the range 400–700 nm in free space are visible to the human eyeSyllabus objective