A ground reciver is receiving a signal at (a) 5 MHz, and (b) 100 MHz, transmitted from a ground transmitter at a height of 300 m located at a distance of 100 km, Identify whether it is coming via space wave or sky wave propagation or satellite transponder. [Radius of earth `~~ 6.4 xx 10^(6) m , N_(max)` of ionosphere `= 10^(12) m^(3)`]

Explanation

To solve the problem of identifying the type of wave propagation for the given frequencies (5 MHz and 100 MHz) transmitted from a ground transmitter at a height of 300 m and located at a distance of 100 km, we will follow these steps:

### Step 1: Calculate the maximum range for space wave propagation
The formula for the maximum range (R) of space wave propagation is given by:

\[ R = \sqrt{2 \cdot h \cdot R_e} \]
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