Question

Download Solution PDF

In optical fibers, the Rayleigh scattering is proportional to:

This question was previously asked in
UGC NET Paper 2: Electronic Science 3rd Dec 2021 Shift 2
Download PDF Attempt in App
View all UGC NET Papers >

Answer (Detailed Solution Below)

Option 4 :
Free Tests
View all Free tests >
Free
UGC NET Paper 1: Held on 21st August 2024 Shift 1
50 Qs. 100 Marks 60 Mins
Start Now

Detailed Solution

Download Solution PDF

Key Points

  • Scattering of light: The phenomenon in which the light ray is redirected in all other directions on passing through particles of dimensions comparable to the wavelength of the light used is called scattering of light.
  • Rayleigh scattering: The scattering of light off of the molecules of the air that can be extended to scattering from particles up to about a tenth of the wavelength of the light used is called Rayleigh scattering.

According to Rayleigh scattering:

Where λ is wavelength of light.

So, the correct option is 

Download Solution PDF
Latest UGC NET Updates

Last updated on Jun 22, 2025

-> The UGC Net Admit Card has been released on its official website today.

-> The UGC NET June 2025 exam will be conducted from 25th to 29th June 2025.

-> The UGC-NET exam takes place for 85 subjects, to determine the eligibility for 'Junior Research Fellowship’ and ‘Assistant Professor’ posts, as well as for PhD. admissions.

-> The exam is conducted bi-annually - in June and December cycles.

-> The exam comprises two papers - Paper I and Paper II. Paper I consists of 50 questions and Paper II consists of 100 questions. 

-> The candidates who are preparing for the exam can check the UGC NET Previous Year Papers and UGC NET Test Series to boost their preparations.

‹‹ Previous Ques
Next Ques ››
Exams Tests Super Practice

More Optical Fiber Questions

Q1.The core refractive index and a relative refractive index difference of a multimode step-index fiber are specified as 1.5 and 2%, respectively. At operating wavelength of 1300 nm, the approximate number of propagating modes is 1000. The diameter of the fiber core is :
Q2.The maximum digital transmission rates for unipolar return-to-zero data transmissions over an optical fiber 10-km long with specified pulse-spreading constant of 10 ns/km is : 
Q3.In which of the following are the optical fibers commonly used ?
Q4.In optical fibers, following statements are given: (A) \(\rm\frac{1}{v_s} = −\frac{λ^2}{2 \pi c} \frac{d b}{d λ}\) (B) vg = \(\rm −\frac{λ^2}{2 \pi c}\)dβ/dλ (C) D = \(\rm −\frac{2 \pi c}{\pi^2}\)β2 (D) β2 = \(\rm −\frac{2 \pi c}{\pi^2}\) . D (E) Material dispersion is a function of (λ) wavelength Choose the correct answer from the options given below:
Q5.A graded indexed optical fiber has a parabolic refractive index profile (α = 2). If the fiber has a numerical aperture = 0.22 the total number of guided modes at a wavelength of 1310 nm is given by:
Q6.Fibre optic power meters have input for attaching fiber optic connector and detector:
Q7.In optical fibers, the Rayleigh scattering is proportional to:
Q8.In a multimode fiber (step index), number of modes passing at an operating wavelength of 1300 nm are 1000, the refractive index of the core is 1.50 and that of the cladding is 1.48. The value of core diameter is:
Q9.Approximately what is the frequency limit of an optical fiber?
Q10.In a graded index fiber, total reflected light takes a -

More Waveguides and Guided Waves Questions

Q1.A rectangular waveguide has dimensions 1 cm × 0.5 cm. Its cut off frequency is : 
Q2.__________ number of 3-dB couplers are needed for a 64 × 64 bi-directional star coupler. 
Q3.The core refractive index and a relative refractive index difference of a multimode step-index fiber are specified as 1.5 and 2%, respectively. At operating wavelength of 1300 nm, the approximate number of propagating modes is 1000. The diameter of the fiber core is :
Q4.The maximum digital transmission rates for unipolar return-to-zero data transmissions over an optical fiber 10-km long with specified pulse-spreading constant of 10 ns/km is : 
Q5.With the reduction in actual permittivity, the relative permittivity ______.
Q6.Which of the following modes has the solution of Hz = 0, but Ez ≠ 0?  
Q7.A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1  Ω /m. If the line is distortionless, the attenuation constant is 
Q8.In which of the following are the optical fibers commonly used ?
Q9.The wavelength of a signal propagating in a waveguide is always _______ its free space wavelength.
Q10.In optical fibers, following statements are given: (A) \(\rm\frac{1}{v_s} = −\frac{λ^2}{2 \pi c} \frac{d b}{d λ}\) (B) vg = \(\rm −\frac{λ^2}{2 \pi c}\)dβ/dλ (C) D = \(\rm −\frac{2 \pi c}{\pi^2}\)β2 (D) β2 = \(\rm −\frac{2 \pi c}{\pi^2}\) . D (E) Material dispersion is a function of (λ) wavelength Choose the correct answer from the options given below:

More Electromagnetic Theory Questions

Q1.In a magnetic circuit, if the reluctance of a path increases, which of the following occurs?
Q2.Which of the following is true about microwaves in unguided media?
Q3.Why does magnetic fringing occur at the ends of a magnetic circuit?
Q4.According to Laplace's Law of Magnetic Circuits, the magnetic field strength H in a core is directly proportional to the magnetomotive force (MMF) and inversely proportional to the length of the magnetic path. If the MMF is increased by a factor of 2, and the length of the magnetic path is halved, what will be the change in the magnetic field strength H?
Q5.Which factor is primarily responsible for distortion in a transmitted signal?
Q6.In a series magnetic circuit, if the reluctance of one path increases, what will happen to the total magnetic flux in the circuit?
Q7.The magnetic field outside a toroidal coil:
Q8.The magnetic field inside a solenoid is:
Q9.Force on a current-carrying conductor will be _________ when it is placed at right angles to the direction of the magnetic field.
Q10.In a series magnetic circuit, ___________ flux φ flows through each part of the circuit.
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
support@testbook.com
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Hot Links： teen patti 3a teen patti real cash 2024 teen patti stars teen patti - 3patti cards game downloadable content teen patti real cash game