Question 69-1 : Radio theory. the mix of an electromagnetic wave with another is called ? [ Concept DJI ]

Question 69-2 : Radio theory. the phenomenon of a change in direction of an radio wave em wave occurring due to a change in its speed is called ?

Question 69-3 : Radio theory. the phenomenon by which wave energy bends around a permeable obstacle is called ?

Question 69-4 : Radio theory. vhf very high frequency waves appear in the frequency spectrum ?

Question 69-5 : Radio theory. when the fading damping of a radio wave is so important that no signal can be received, this phenomenon is ?

Question 69-6 : Radio theory. to double the effective range of a radio transmission, the power output must be increased by a factor of ?

Question 69-7 : Radio theory. 'fading' is ?

Question 69-8 : Radio theory. radio waves travel at ?

Question 69-9 : Radio theory. radio waves travel at a speed of ?

Question 69-10 : Radio theory. a radio signal looses strength as range from the transmitter increases, this is called ?

Question 69-11 : Radio theory. an electromagnetic wave has two types of energy field ?

Question 69-12 : Radio theory. an electromagnetic wave consists of an oscillating electric field e and an oscillating magnetic field h. which statement is correct ?

Question 69-13 : Radio theory. an electromagnetic wave consists of an oscillating electric field e and an oscillating magnetic field h. their propagation speed is ?

Question 69-14 : A position located east of the prime meridian and south of the equator is ?

Question 69-15 : A vor vhf omnidirectional range is ?