Question

The wavelength of electromagnetic waves of frequency $5\times 10^{14}Hz$ is (in angstrom) is

• A. $5000$
• B. $3500$
• C. $6200$
• D. $6000$

Answer 1

Answer: (D)

$\upsilon =5\times 10^{14}Hz$
For em wave : $c=3\times 10^{8}m{s}^{-1}$
and $\lambda =\frac{c}{\upsilon }=\frac{3\times 10^8}{5\times 10^{14}}m$
$=6\times 10^{-7}m$
$=6000\mathring{A}$