Ionosphere facilitates radio communication because of

1. Presence of ozone causes the reflection of radio waves to Earth.
2. Radio waves have a very long wavelength.

Select the correct answer using the codes given below:
a) 1 only
b) 2 only
c) Both 1 and 2
d) None of the above

Ans-[B]

Explanation- Statement 1 is wrong. Ionosphere contains charged particles due to which electromagnetic radio waves gets reflected and communication becomes possible. It is not due to ozone. Ozone is found mainly in Stratosphere and in traces in troposphere. It’s main function is absorption of  UV rays. Statement 2 is right. You can see wavelength of Radio waves is in metres to kilometres.

The Electromagnetic Spectrum