Question

The frequency of radiation with wavelength 480 nm is:

• A. $6.25\times {10}^{14}Hz$
• B. $6.25\times {10}^{13}Hz$
• C. $6.25\times {10}^{12}Hz$
• D. $6.25\times {10}^{11}Hz$

Answer 1

The correct option is A $6.25\times {10}^{14}Hz$

Given that:
wavelength $\lambda =480nm=480\times {10}^{-9}m$
$c=3\times {10}^{8}m/s$
We know, c = $v\lambda$
$v=\frac{c}{\lambda }=\frac{3\times {10}^8}{480\times {10}^{-9}}=6.25\times {10}^{14}{s}^{-1}or6.25\times {10}^{14}Hz$