A) 1018 Hz
B) 1014 Hz
C) 109 Hz
D) 1016 Hz
Correct Answer: B
Solution :
Key Idea: Infrared rays are electromagnetic rays having velocity \[3\times {{10}^{8}}m/s\]. We know that Frequency \[=\frac{velocity}{wavelength}\] For infrared rays \[\lambda =10,000\,\overset{o}{\mathop{A}}\,={{10}^{4}}\times {{10}^{10}}m={{10}^{-6}}m\] \[\therefore \] \[f=\frac{3\times {{10}^{8}}}{{{10}^{-6}}}=3\times {{10}^{14}}Hz\] Hence, frequency of infrared rays is approximately \[{{10}^{14}}Hz\].
You need to login to perform this action.
You will be redirected in
3 sec
