Green light of frequency 550 × 1012 Hz has a wavelength of 550 × 10-9 m.
What is possible for red light?
a frequency of 750×1012 Hz750 \times 10^{12}\text{ Hz}750×1012 Hz and a wavelength of 400×10−9 m400 \times 10^{-9}\text{ m}400×10−9 m
a frequency of 750×1012 Hz750 \times 10^{12}\text{ Hz}750×1012 Hz and a wavelength of 750×10−9 m750 \times 10^{-9}\text{ m}750×10−9 m
a frequency of 400×1012 Hz400 \times 10^{12}\text{ Hz}400×1012 Hz and a wavelength of 400×10−9 m400 \times 10^{-9}\text{ m}400×10−9 m
a frequency of 400×1012 Hz400 \times 10^{12}\text{ Hz}400×1012 Hz and a wavelength of 750×10−9 m750 \times 10^{-9}\text{ m}750×10−9 m
198 exam-style questions on CIE IGCSE Physics Electromagnetic spectrum, covering Electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.