Question

The frequency of yellow light having wavelength $600nm$ is:

• A. $5\times {10}^{14}Hz$
• B. $5\times {10}^{17}Hz$
• C. $2.5\times {10}^{14}Hz$
• D. $2.5\times {10}^{7}Hz$

Answer 1

Answer: (A)

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