Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.

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Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.

Third

Fourth

Fifth

Sixth

Third

Fourth

Fifth

Sixth

When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have

Low-pass filters

The restricted high-frequency response

The shortest possible time

A long time constant

Low-pass filters

The restricted high-frequency response

The shortest possible time

A long time constant

Microwave Communication

It is possible to increase the maximum range of a radar equipment by

Lowering the pulse frequency

Narrowing the beam width and increasing the pulse duration

Raising the peak power of the transmitter

All of these

Lowering the pulse frequency

Narrowing the beam width and increasing the pulse duration

Raising the peak power of the transmitter

All of these

Microwave Communication

The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Degree of emission from the cathode

Distributed lead inductance

Inter-electrode capacitance

Electron transit time

Degree of emission from the cathode

Distributed lead inductance

Inter-electrode capacitance

Electron transit time

Microwave Communication

A high-power microwave pulse of the order of megawatts can be generated by a

Reflex klystron

Gunn diode

Magnetron

Traveling-wave tube

Reflex klystron

Gunn diode

Magnetron

Traveling-wave tube

Microwave Communication

Coupling into and out of a traveling-wave tube can be accompanied by a

Waveguide match

Cavity match

All of these

Direct coax-helix match

Waveguide match

Cavity match

All of these

Direct coax-helix match

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Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.

When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have

It is possible to increase the maximum range of a radar equipment by

The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

A high-power microwave pulse of the order of megawatts can be generated by a

Coupling into and out of a traveling-wave tube can be accompanied by a

Google

Android

Apple

Facebook

Telegram

Instagram