PH-2239

Wave speed

Physics · Secondary 4 · Medium · Wave speed

Visible light travels in water with a speed of

2.25\times10^8\,\text{m s}^{-1}

. The wavelength of red light in water is

6.0\times10^{-7}\,\text{m}

. Using the wave equation

v = f\lambda

, what is the frequency of this red light?

$3.75\times10^{14}\,\text{Hz}$
$1.35\times10^{16}\,\text{Hz}$
$3.75\times10^{13}\,\text{Hz}$
$1.35\times10^{15}\,\text{Hz}$

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