Physics 0625 · IGCSE · Electromagnetic spectrum

Electromagnetic spectrum — practice question

Blue light has a usual wavelength of $5.0 \times 10^{-7}\,\text{m}$ and a frequency of $0.60 \times 10^{15}\,\text{Hz}$. Which row shows a usual wavelength and frequency for red light?

  • Awavelength $2.4 \times 10^{-7}\,\text{m}$, frequency $0.40 \times 10^{15}\,\text{Hz}$
  • Bwavelength $2.4 \times 10^{-7}\,\text{m}$, frequency $1.3 \times 10^{15}\,\text{Hz}$
  • Cwavelength $6.9 \times 10^{-7}\,\text{m}$, frequency $0.40 \times 10^{15}\,\text{Hz}$
  • Dwavelength $6.9 \times 10^{-7}\,\text{m}$, frequency $1.3 \times 10^{15}\,\text{Hz}$

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