JEE Main2017PhysicsCommunication SystemActual
A signal is to be transmitted through a wave of wavelength λ , using a linear antenna. The length l of the antenna and effective power radiated P eff will be given, respectively, as- ( K is a constant of proportionality)
Options
- Aλ 8 ,   P eff = K l λ
- Bλ 16 ,   P eff = K l λ 3
- Cλ 5 ,   P eff = K l λ 1 2
- Dλ ,   P eff = K l λ 2
Correct answer
D. λ ,   P eff = K l λ 2
Step-by-step solution
Length of antenna = comparable to λ Power P ∝ ( l λ ) 2 .