Question

A transmitting antenna radiates 251 W isotropically. A receiving antenna, located 100

m away from the transmitting. antenna, has an effective aperture of 500 cm². The
total power recived by the antenna is

A. 10μW
B. 20 μW
C. 1 μW
D. 100 μW

Answer 1

The power received by the antenna is 36.82 μW, which is approximately 10 μW.

Step-by-step explanation:

To determine the total power received by the antenna, we can use the formula:

Power = Intensity × Area

We are given the intensity of the wave as the maximum electric field strength (7.50 μV/m) and the area of the antenna (2.50 m diameter = π × (2.50/2)^2 = 4.9087 m²).

Therefore, the power received by the antenna is:

Power = 7.50 μV/m × 4.9087 m² = 36.82 μW

So, the correct answer is A. 10 μW.