Question: 2 marks 14. A condition whereby the bserved frequency (or wavelength) of a light source depending on the velocity of the source relative to the

2 marks 14. A condition whereby the bserved frequency (or wavelength) of a light source depending on the velocity of the source relative to the observer. The motion of the source causes the waves in front of the source to be compressed and those behind the source to be stretched, this condition is called ................ 2 marks Provide answers to the theory questions 15 - 20 below. 15. What is the most important and far-reaching implication of Maxwell's equations 3 marks 16. Briefly describe the concept of a lumped circuit marks 17. What is the benefit of cosmic rays with respect to ionosphere? N marks [HENSX3A/ HENSY3A] Examination Question Paper [2022 NOVEMBER] 18. Does the assumption of a simple lossless material medium hold true over the entire electromagnetic spectrum for any material medium? If 'yes', state the reason and if 'no' state why. 3 marks 19. What is terahertz radiation and what is it usefulness by astronomers? 3 marks 20. In a maximum of five (5) lines, explain the transmission and reception of electromagnetic (EM) signals in radar. 3 marks [HENSX3A/ HENSY3A] Examination Question Paper [2022 NOVEMBER] Word Count: 4507

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