A layer in the Earth’s atmosphere called ionosphere facilities 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?

[UPSC Civil Services Exam – 2011 Prelims]

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2


Answer: (d)        

Explanation:

The Ionosphere:

  • This layer is located between 80 km and 400 km and is an electrically charged layer.
  • This layer is characterized by the ionization of atoms.
  • Because of the electric charge, radio waves transmitted from the earth are reflected back to the earth by this layer.
  • Ozone can be found in Stratosphere. Hence, statement 1 is incorrect.
  • Radio waves are a type of electromagnetic (EM) radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
  • They have frequencies from 300 GHz to as low as 3 kHz and corresponding wavelengths from 1 millimetre to 100 kilometres. Hence, statement 2 is incorrect.

Consider the following statements:                                                                   The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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Consider the following statements:                                                         The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

Read More »
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