Question

The frequency of a wave light is $1.0\times {10}^6{s}^{-1}$. The wavelength for this wave is :

• A. $3\times {10}^{4}cm$
• B. $3\times {10}^{-4}cm$
• C. $6\times {10}^{4}cm$
• D. $6\times {10}^{6}cm$

Answer 1

The correct option is A $3\times {10}^{4}cm$

$f\times \lambda =c$

Where, $f=$ frequency

$\lambda =$ wavelength

$c=$ speed of light in vacuum

$\lambda =\frac{3\times {10}^{8}m/s}{1.0\times {10}^6{s}^{-1}}$

$=3\times {10}^{2}m=3\times {10}^{4}cm$

Therefore, the correct option is A.