Question

Find out the wavelength of a light wave travelling at $3\times {10}^{8}m/s$ has a frequency of $6\times {10}^{15}Hz$.

• A. $5\times {10}^{-8}m$
• B. $2\times {10}^{-7}m$
• C. $5\times {10}^{-7}m$
• D. $5\times {10}^{-6}m$
• E. $2\times {10}^{7}m$

Answer 1

Answer: (A)

$5\times {10}^{-8}m$

We know that , velocity $=$ wavelength $\times$ frequency

So, wavelength $=\frac{3\times {10}^8}{6\times {10}^{15}}=5\times {10}^{-8}m$