Answer:
All of these are natural resources.
Explanation:
Because they are not manufactured.
To calculate this we will use the light equation:
![c=](https://tex.z-dn.net/?f=c%3D)
λ
![*f](https://tex.z-dn.net/?f=%2Af)
We have Frequency
![f=9.4* 10^{9}Hz](https://tex.z-dn.net/?f=f%3D9.4%2A%2010%5E%7B9%7DHz%20)
.
We know that speed of light in vacuum is
![c =3.8* 10^{8} m/s](https://tex.z-dn.net/?f=c%20%3D3.8%2A%2010%5E%7B8%7D%20m%2Fs%20)
.
Since a unit of speed of light is m/s, we can change the unit of frequency Hz to 1/s, since Hz means cycles per second (f=1/T).
So:
![f=9.4* 10^{9}1/s](https://tex.z-dn.net/?f=f%3D9.4%2A%2010%5E%7B9%7D1%2Fs%20)
<span>
![c =3.8* 10^{8} m/s](https://tex.z-dn.net/?f=c%20%3D3.8%2A%2010%5E%7B8%7D%20m%2Fs%20)
</span>
<span>
![c=](https://tex.z-dn.net/?f=c%3D)
λ
![*f](https://tex.z-dn.net/?f=%2Af)
</span>⇒ λ
![= \frac{c}{f}](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7Bc%7D%7Bf%7D%20)
⇒ λ
![= \frac{3.8* 10^{8}}{9.4* 10^{9}}](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B3.8%2A%2010%5E%7B8%7D%7D%7B9.4%2A%2010%5E%7B9%7D%7D%20)
⇒ <span>λ</span>
It is not what you thing it is but the answer is true