Question

calculate the frequency in hertz of electromagnetic radiation that has a wavelength of 685.0 nm.

Answer 1

• Wavelength($\lambda$)=685nm

$\\ \sf\bull\longmapsto \lambda=\dfrac{c}{v}$

$\\ \sf\bull\longmapsto v=\dfrac{c}{\lambda}$

$\\ \sf\bull\longmapsto v=\dfrac{3\times 10^8}{685\times 10^{-9}m}$

$\\ \sf\bull\longmapsto v=0.00437\times 10^{17}Hz$

$\\ \sf\bull\longmapsto v=4.3\times 10^{14}Hz$