Physics 5054 · O Level · Electromagnetic spectrum

Electromagnetic spectrum — practice question

In an experiment, the microwaves have a frequency of $3.0 \times 10^9\,\text{Hz}$. In air, their speed is $3.0 \times 10^8\,\text{m s}^{-1}$. Give one possible frequency and one possible speed in air for a radio wave?

  • Afrequency $3.0 \times 10^5\,\text{Hz}$, speed $1500\,\text{m s}^{-1}$
  • Bfrequency $3.0 \times 10^5\,\text{Hz}$, speed $3.0 \times 10^8\,\text{m s}^{-1}$
  • Cfrequency $3.0 \times 10^{14}\,\text{Hz}$, speed $1500\,\text{m s}^{-1}$
  • Dfrequency $3.0 \times 10^{14}\,\text{Hz}$, speed $3.0 \times 10^8\,\text{m s}^{-1}$

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