The wavelength of the light coming from an infra-red heating lamp is 5.00 × 10^{-4} cm.

Question

The wavelength of the light coming from an infra-red heating lamp is $5 \cdot 00 \times 10^{-4} cm$. Calculate the frequency of this emitted light.

Answer 1

We know that $c=v \lambda$;

where $c=$ velocity of radiation $=3 \cdot 0 \times 10^{10} cm / s$

$\therefore \quad v=\frac{c}{\lambda}=\frac{3 \cdot 0 \times 10^{10} cm / s }{5 \cdot 0 \times 10^{-4} cm }=6 \cdot 0 \times 10^{13} s ^{-1}= 6 \cdot 0 \times 10^{13} H z .$