Question

Assertion : Sometimes HF waves can also pass through ionosphere
Reason : The sky wave propagation depends on the vertical angle with which the radio waves are radiated from the antenna

• A. Assertion and reason are true and reason is the correct explanation of assertion
• B. Assertion and reason are true but reason is not correct explanation of assertion
• C. Assertion is true but reason is false
• D. Assertion is false but Reason is true

Answer 1

The correct option is A Assertion and reason are true and reason is the correct explanation of assertion

Depending upon the transmitting antenna, signals entering the ionosphere at a steep angle (near-vertical incidence) may be back-scattered down to Earth within a short range. Alternatively, signals beamed close to the horizon enter the ionosphere at a shallow angle and return to Earth over medium to long distances.