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GATE ECE 1999 | Question 2.23

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A trasmitting antenna radiates $251 \mathrm{~W}$ isotropically. A receiving antenna, located $100 \mathrm{~m}$ away from the transmitting antenna, has an effective aperture of $500 \mathrm{~cm}^{2}$. The total received by the antenna is

  1. $10 \; \mu \mathrm{W}$
  2. $1 \; \mu \mathrm{W}$
  3. $20 \; \mu \mathrm{W}$
  4. $100 \; \mu \mathrm{W}$

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