Two electromagnetic waves, Wave P and Wave Q, are travelling through a vacuum.
Which of the following statements is correct regarding their wave speeds and wavelengths?
Both waves travel at the same speed of 3.0×108 m s−13.0 \times 10^8 \text{ m s}^{-1}3.0×108 m s−1 in a vacuum, and Wave P has a longer wavelength (λP=2.0×10−6 m\lambda_P = 2.0 \times 10^{-6} \text{ m}λP=2.0×10−6 m) than Wave Q.
Wave Q travels faster than Wave P because Wave Q has a higher frequency (fQ=7.5×1014 Hzf_Q = 7.5 \times 10^{14} \text{ Hz}fQ=7.5×1014 Hz), while Wave P has a longer wavelength (λP=2.0×10−6 m\lambda_P = 2.0 \times 10^{-6} \text{ m}λP=2.0×10−6 m).
Both waves travel at the same speed of 3.0×108 m s−13.0 \times 10^8 \text{ m s}^{-1}3.0×108 m s−1 in a vacuum, but Wave Q has a longer wavelength than Wave P because Wave P's wavelength is 5.0×10−7 m5.0 \times 10^{-7} \text{ m}5.0×10−7 m.
Wave P travels faster than Wave Q because Wave P has a longer wavelength (λP=2.0×10−6 m\lambda_P = 2.0 \times 10^{-6} \text{ m}λP=2.0×10−6 m), while Wave Q's frequency is 7.5×10−15 Hz7.5 \times 10^{-15} \text{ Hz}7.5×10−15 Hz.