Home
Class 12
PHYSICS
Estimate the fastest bit rate capable of...

Estimate the fastest bit rate capable of being carried by light of wavelength `1.3 mu m`. How many phone calls could be carried at this bit rate ? Band width of optical fibre = 2 GHz.

A

`2.9xx10^(7)`

B

`1.5xx10^(6)`

C

`2.3xx10^(5)`

D

`1.7xx10^(4)`

Text Solution

Verified by Experts

The correct Answer is:
C
Here, `lambda=1.3xx10^(-6)Hz`
`v=(c)/(lambda)=(3xx10^(9))/(1.3xx10^(-6))=2.3xx10^(14)Hz`
Max bit rate `=2U=2xx2.3xx10^(14)=4.6xx10^(14)Hz`
For optical fibre, band width =2GHz=`2xx10^(2)Hz`
`therefore` No. of phone calls `=(4.6xx10^(14))/(2xx10^(4))=2.3xx10^(3)`
Promotional Banner

Topper's Solved these Questions

  • COMMUNITCATION SYSTEMS

    NCERT FINGERTIPS|Exercise Detection Of Amplitude Modulation Wave|12 Videos

  • ATOMS

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

  • CURRENT ELECTRICITY

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

(a) Calculate the momentum of a photon of light of wavelength 500 nm. (b) Find the number of photons emitted per second by a 25 W sourse of monochromatic light of wave length 600 nm. (c) How many photons per second does a one watt bulb emit if its efficiency is 10% and the wavelength of light emitted is 500 nm? (d) Monochromatic light of wavelength 300 nm is incident normally on a surface of area 4 cm^(2) . If the intensity of light is 150 m W//m^(2) , determine the rate at which photons strike the surface.

[" The banwidth of optical fiber is "2GHz" and "],[" light of wavelength "1.3 mu m" is used for "],[" transmission of phone - calls.The "],[" maximum number of phone calls that "],[" could be carried by this fiber is "],[2.3times10^(n)" .The value of "n" is."]

The index of refraction of a glass plate is 1.48 at theta_(1) = 30.^@C and varies linearly with temperature with a coefficient of 2.5 xx 10^(-5).^@C^(-1) . At 3 0.^@C , the length of the glass plate is 3 cm. This plate is placed in front of one of the slit n Young's double-slit experiment. If the plate is being heated so that it temperature increases at a rate of 5^(@)C^(-1) min, the light sources has wavelength lambda = 589 nm and the glass plate initially ia at theta = 30^@C . The number of fringes that shift on the screen in each minute is nearly (use approximation)

A very large metal plate carries a charge of Q=-1C . The work function for the metal is phi = 3eV The plate is illuminated by a 60 watt light source with a wavelength lambda of 330nm . How long does it take to completely discharge the plate? (Assume that every efficient photon ejects electron which is instantly removed from the sheet surface. (All photons ejected from light source fall normally on the metal plate) ( h=6.6 xx 10^(-34) m^2 kg//s )

Energy from the sun is recived on earth at the rate of 2 cal per cm^(2) per min. If avergae wavelength of solar light be taken at 5500 A then how many photons are recived on the earth per cm^(2) per min ? (h =6.6 xx 10^(-34)J-s, 1cal = 4.2J)