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Q. The frequency of yellow light having wavelength $600 \,nm$ is:

BHUBHU 2005

Solution:

$\lambda=600\, n m=600 \times 10^{-9}\, m=6 \times 10^{-7} \,m$
$c=3 \times 10^{8}\, m / s$
$v=\frac{c}{\lambda}=\frac{3 \times 10^{8}}{6 \times 10^{-7}}$
$=5 \times 10^{14} \,Hz$