Module 10
Terms
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- What is wave propagation
- Invisable force that enables man to comminicate over long distances
- What is a transverse wave?
- Type of wave motion ei- radio, light and heat
- What is a longitudinal wave?
- Sound wave
- What is refraction?
- When a wave traveling through two different mediums passes through the boundry of the mediums and bends towards or away from the Normal.
- What is reverberation?
- The multiple reflections of sound waves
- What is resonance
- It occurs when objects vibrates at its natural freq.
- What antenna transmits an electomagnetic wave perpendiculat to the Earth's surface?
- Vertically polarized
- What antenna transmits an electomagnetic wave parallel to the Earth's surface?
- Horizontally polarized
- That layer of the atmosphere does virtually all weather take place?
- Troposhpere
- What layer of the atmosphere has a little effect on radio waves?
- Stratoshere
- What layer of the atmosphere has electrically charged ions which aid in long distance comms?
- Ionosphere
- What is the difference between surface waves and space waves?
- Surface waves travle along the contour of the earth and space waves travel through the air or can be feflected from the surface of the earth.
- What layer of the earth is responsible for low freqs?
- D
- What layer of the earth is responsible for high freq and long range transmission?
- F
- Define reciprocity
- The various properties fo the antenna apply equally to transmitting and receiving.