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Question:

A signal is to be transmitted through a wave of wavelength $\lambda$, using a linear antenna. The length 1 of the antenna and effective power radiated $\mathrm{P}_{\text {eff }}$ will be given respectively as :

( $\mathrm{K}$ is a constant of proportionality)

1. $\lambda, \mathrm{P}_{\mathrm{eff}}=\mathrm{K}\left(\frac{1}{\lambda}\right)^{2}$

2. $\frac{\lambda}{8}, \mathrm{P}_{\mathrm{eff}}=\mathrm{K}\left(\frac{1}{\lambda}\right)$

3. $\frac{\lambda}{16}, \mathrm{P}_{\mathrm{eff}}=\mathrm{K}\left(\frac{1}{\lambda}\right)^{3}$

4. $\frac{\lambda}{5}, \mathrm{P}_{\mathrm{eff}}=\mathrm{K}\left(\frac{1}{\lambda}\right)^{\frac{1}{2}}$

Correct Option: 1

JEE Main Previous Year 1 Question of JEE Main from Physics Communication Systems chapter.
JEE Main Previous Year Online April 9, 2017

Solution:

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