Question

Yellow colours seen in fireworks are due to the emission of light with wavelength around 588 nm when sodium salts are burned. Calculate the frequency of yellow light of wave length 588 nm.

Answer 1

$\lambda =588nm$

$\nu \lambda =c$

$\nu =\frac{3\times {10}^{8}m{s}^{-1}}{588\times {10}^{9}m}$

$=5.1\times {10}^{14}{s}^{-1}$

$=5.1\times {10}^{14}Hz$