Assertion: The ionosphere layer acts as a reflector for all range of frequencies.
Reason: Ionosphere does not allow electromagnetic wav e to penetrate and escape.

Assertion : Television signals are received through sky-wave propagation Reason : The ionosphere reflects eletro magnetic waves of frequencies greater than a certain critical frequency.

Assertion: In ionospheric reflection, phase change does not occurs with the light wave. Reason: The ionosphere reflection is similar to the tatol internal reflection is similar to the total internal reflection in miral.

Assertion: In ionospheric reflection, phase change does not occurs with the light wave. Reason: The ionosphere reflection is similar to the tatol internal reflection is similar to the total internal reflection in miral.

Assertion : Gamma rays, penetrates through materials most effectively. Reason : Gamma rays, which have the shortest wavelengths of all electromagnetic radiation.

Assertion : Increasing carbon dioxide causes global warming Reason : Carbon dioxide does not allow solar radiations re-radiated by earth to escape into space.