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Question: Answered & Verified by Expert
A $100 \mathrm{~m}$ long antenna is mounted on a $500 \mathrm{~m}$ tall building. The complex can become a transmission tower for waves with $\lambda$
PhysicsCommunication System
Options:
  • A
    $\sim 400 \mathrm{~m}$
  • B
    $\sim 25 \mathrm{~m}$
  • C
    $\sim 150 \mathrm{~m}$
  • D
    $\sim 2400 \mathrm{~m}$
Solution:
2783 Upvotes Verified Answer
The correct answer is:
$\sim 2400 \mathrm{~m}$
Given, length of the building (l) is $=500 \mathrm{~m}$, Height or length of antenna from the ground height of building + hight of antenna $=(500+100)=600 \mathrm{~m}$
we know that, wavelength of the wave which can be transmitted by
$$
\lambda=4 l=4 \times 600=2400 \mathrm{~m}
$$

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