Question 26-1 : Radio theory .frequency is defined as the ? [ Candidate takeoff ]
Number of cycles occurring in one second in a radio wave expressed in hertz hz
Question 26-2 : Radio theory .wavelength is defined as the ?
Physical distance travelled by a radio wave during one cycle of transmission
Question 26-3 : Radio theory .the mix of an electromagnetic wave with another is called ?
Interference
Question 26-4 : 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 ?
Refraction
Question 26-5 : Radio theory .the phenomenon by which wave energy bends around a permeable obstacle is called ?
Diffraction
Question 26-6 : Radio theory .vhf very high frequency waves appear in the frequency spectrum ?
30 mhz 300 mhz
Question 26-7 : Radio theory .when the fading damping of a radio wave is so important that no signal can be received this phenomenon is ?
Absorption
Question 26-8 : Radio theory .to double the effective range of a radio transmission the power output must be increased by a factor of ?
4
Question 26-9 : Radio theory .'fading' is ?
Interference between surface wave and sky wave
Question 26-10 : Radio theory .radio waves travel at ?
The speed of light
Question 26-11 : Radio theory .radio waves travel at a speed of ?
300000 km/s
Question 26-12 : Radio theory .a radio signal looses strength as range from the transmitter increases this is called ?
Attenuation
Question 26-13 : Radio theory .an electromagnetic wave has two types of energy field ?
An e electrical field and h magnetic field
Question 26-14 : Radio theory .an electromagnetic wave consists of an oscillating electric field e and an oscillating magnetic field h which statement is correct ?
The e and h fields are perpendicular to each other
Question 26-15 : Radio theory .an electromagnetic wave consists of an oscillating electric field e and an oscillating magnetic field h their propagation speed is ?
The speed of light
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