A layer in the Earth’s atmosphere called Ionosphere facilitates radio communication. Why?1. The presence of ozone causes the reflection of radio waves to Earth.2. Radio waves have a very long wavelength.Which of the statements given above is/are correct?
✓ Correct answer: d) Neither 1 nor 2
ExplanationStatement 1 is incorrect: The presence of ions, and not ozone, in the Ionosphere is responsible for radio communication.Ozone is primarily present in the Stratosphere and not in the Ionosphere.Statement 2 is incorrect: They have frequencies from 300 GHz to as low as 3 kHz and corresponding wavelengths from 1 millimetre to 100 kilometres.They have a long range of wavelengths, so they can have very small wavelengths as well.Science and Technology 583 212
Practice more Science PYQs
Attempt a free 10-question quiz or browse the full Science & Technology previous-year-question bank with instant answers and explanations.
🔬 Science PYQs →