Question

Find out the frequency of orange light whose wavelength is $6\times {10}^{-7}m$. The speed of light is $3\times {10}^{8}m/s$.

• A. $2\times {10}^{15}Hz$
• B. $2\times {10}^{-15}Hz$
• C. $5\times {10}^{14}Hz$
• D. $5\times {10}^{-14}Hz$
• E. $2\times {10}^{14}Hz$

Answer 1

The correct option is C $5\times {10}^{14}Hz$

Given : $\lambda =6\times {10}^{-7}$ $m$ $v=3\times {10}^8$ $m/s$

Frequency of light $\nu =\frac{v}{\lambda }=\frac{3\times {10}^8}{6\times {10}^{-7}}=5\times {10}^{14}$ $Hz$