JEE Main 2022 · 25 Jun · Shift 1 · Physics Q48

PhysicsSingle correct+4 / -1Question 48 of 90

A signal of 100 THz frequency can be transmitted with maximum efficiency by :

Coaxial cable

Optical fibre

Twisted pair of copper wires

Water

Answer and worked solution

Official answer: B

Wavelength. $\lambda=\dfrac{3\times10^8}{10^{14}}=3\ \mu$ m, in the infrared, which optical fibres carry best.

(B)

Topics:Propagation of EM waves Electromagnetic spectrum

JEE Main 2022 · 25 Jun · Shift 1, Physics question 48