MCQ
A signal of $100 \,THz$ frequency can be transmitted with maximum efficiency by
  • A
    Coaxial cable
  • Optical fibre
  • C
    Twisted pair of copper wires
  • D
    Water

Answer

Correct option: B.
Optical fibre
b
Optical fibre frequency range is $1 \,THz$ to $1000 \,THz$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A person is suffering from myopic defect. He is able to see clear objects placed at $15 \,cm$. What type and of what focal length of lens he should use to see clearly the object placed $60 \,cm$ away
A ray of light making an angle $10^o$ with the horizontal is incident on a plane mirror making a angle $\theta $ with the horizontal. What should be the value of $\theta $ so that the reflected ray goes vertically upwards....$^o$
Two identical parallel plate capacitors of capacitance $C$ each are connected in series with a battery of emf, $E$ as shown below. If one of the capacitors is now filled with a dielectric of dielectric constant $k$, then the amount of charge which will flow through the battery is (neglect internal resistance of the battery)
In the first second of its flight, rocket ejects $1/60$ of its mass with a velocity of $2400\,m/s$. The acceleration of the rocket is ............ $ms^{-2}$
When the current change from $+ 2\,A$ to $-2\,A$ in $0.05$ $second$, an $e.m.f$. of $8 \,V$ is induced in a coil. The coefficient of self-induction of the coil is.....$H$
Photons of energy $7 \,eV$ are incident on two metals $A$ and $B$ with work functions $6 \,eV$ and $3 \,eV$, respectively. The minimum de-Broglie wavelengths of the emitted photoelectrons with maximum energies are $\lambda_A$ and $\lambda_B$ respectively, where $\lambda_A / \lambda_B$ is nearly
Figure shows two blocks connected by a light inextensible string as shown in figure. A force of $10 \,N$ is applied on the bigger block at $60^{\circ}$ with horizontal, then the tension in the string connecting the two masses is ....... $N$
In the arrangement shown in the figure, mass of the block $B$ and $A$ is $2m$ and $m$ respectively. Surface between $B$ and floor is smooth. The block $B$ is connected to the block $C$ by means of a string pulley system. If the whole system is released, then find the minimum value of mass of block $C$ so that block $A$ remains stationary $w.r.t. B$. Coefficient of friction between $A$ and $B$ is $\mu$ 
A nucleus of mass $M + \Delta m$ is at rest and decays into two  daughter nuclei of equal mass $\frac{M}{2}$ each. Speed of light is $c.$

The speed of daughter nuclei is

The time period of oscillation of a freely suspended bar magnet with usual notations is given by