ANSWERS TO QUESTIONS Q1. THROUGH Q48

2-46 ANSWERS TO QUESTIONS Q1. THROUGH Q48. A1. Induction field and radiation field. A2. Induction field. A3. Radiation field. A4. Fundamental frequency. A5. Harmonic frequency or harmonics. A6. 30 meters. A7. 5 megahertz. A8. Vertically polarized. A9. Direction of wave propagation. A10. Shifting in the phase relationships of the wave. A11. Troposphere, stratosphere, and ionosphere. A12. Stratosphere. A13. Whether the component of the wave is travelling along the surface or over the surface of the earth. A14. Radio horizon is about 1/3 farther. A15. Sea water. A16. (a) electrical properties of the terrain (b) frequency (c) polarization of the antenna A17. High energy ultraviolet light waves from the sun. A18. D, E, F₁, and F₂ layers. A19. D layer is 30-55 miles, E layer 55-90 miles, and F layers are 90-240 miles. A20. Thickness of ionized layer. A21. Critical frequency. A22. (a) density of ionization of the layer (b) frequency (c) angle at which it enters the layer A23. A zone of silence between the ground wave and sky wave where there is no reception. A24. Where ionization density is greatest. A25. A term used to describe the multiple pattern a radio wave may follow. A26. Selective fading. A27. Natural and man-made interference.