JEE Main 2022 · 24 Jun · Shift 1 · Physics Q46

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PhysicsSingle correct+4 / -1Question 46 of 90

A baseband signal of 3.5 MHz frequency is modulated with a carrier signal of 3.5 GHz frequency using amplitude modulation method. What should be the minimum size of antenna required to transmit the modulated signal ?

42.8 m

42.8 mm

21.4 mm

21.4 m

Answer and worked solution

Official answer: C

Transmitted wavelength. The modulated signal is radiated at the carrier frequency: $\lambda=\dfrac{3\times10^8}{3.5\times10^9}\approx0.0857$ m.

Antenna size. Minimum $\dfrac\lambda4\approx0.0214$ m $=21.4$ mm.

(C)

Topics:Propagation of EM waves Modulation

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JEE Main 2022 · 24 Jun · Shift 1, Physics question 46