Question

During a test, a NATO surveillance radar system, operating at 23 GHz at 197 kW of power, attempts to detect an incoming stealth aircraft at 101 km. Assume that the radar beam is emitted uniformly over a hemisphere. (a) What is the intensity of the beam when the beam reaches the aircraft's location

Answer 1

Intensity will be equal to
`3.07* 10^(-6)W/m^2`

Step-by-step explanation:

We have given power P = 197 kW = 197000 watt

Distance R = 101 km

Area of the hemisphere will be
`A=2\pi R^2`

`A=2* 3.14* 101000^2=6.4* 10^(10)m^2`

We have to find the intensity

Intensity is equal to
`I=(P)/(A)`

`I=(1.97* 10^5)/(6.4* 10^(10))=3.07* 10^(-6)W/m^2`

So intensity will be equal to
`3.07* 10^(-6)W/m^2`