Question

You might have seen mercury street lamps. The light blue glow given by these lamps has a wavelength of = 436nm. What is its frequency?

Answer 1

$\lambda =436nm$

$\nu =?$

$\nu =\frac{c}{\lambda }$

$\nu =\frac{3\times {10}^{8}m{s}^{-1}}{436\times {10}^{-9}m}$

$\nu =6.88\times {10}^{14}Hz$