# Joint Entrance Examination/AIEEE 2009/Q076 WAVE OPTICS

* Welcome to the Highschool Help Forum!
* The forum is currently in "Beta" stage of development. You can ask questions and answer/discuss them. The basic functionalities are present. What's required is a more aesthetic look to the Static pages and a more user friendly setup. This will happen over the time gradually as we start creating some content.
* The site has a lot of tools, like posting mathematical calculations, images and diagrams; categorizing questions and so on. Having them here is NO GOOD unless you know how to use them. I am thoroughly against compiling a list of these features and then writing about them. As soon as you do not understand how to do something or use a certain feature, report that on "How To"s Section of the forum. Your queries will be answered there.
* If you have any ideas/discussion regarding the site/comments, please go to Discussions regarding Highschool Help Forum
* Lastly, thanks for joining in the site's development process! It matters!
| Original Question by 164.100.170.4 Here's the question... Q76. A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young’s double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the 4th bright fringe of the unknown light. From this data, the wavelength of the unknown light is (1) 885.0 nm (2) 442.5 nm (3) 776.8 nm (4) 393.4 nm Posted by 164.100.170.4 05:36, 24 September 2009 (UTC) Post a reply! | What's Up? Latest discussions on the forum Optics-Help Joint Entrance Examination/2000 Screening/Q014 Intermediate image in a compound microscope Joint Entrance Examination/2000 Screening/Q016 Effect of changing width of slits on interference pattern Joint Entrance Examination/2000 Screening/Q030 Hollow Double Convex Lens with variable liquids inside Joint Entrance Examination/2000 Screening/Q032 Divergent beam passsing from a glass slab Joint Entrance Examination/2000 Screening/Q033 Glass slab in water and total internal reflection Physics-Help User:Thewinster/Sandbox User:Thewinster/Sandbox/Forum-Watch Joint Entrance Examination/2000 Screening/Q014 Intermediate image in a compound microscope Joint Entrance Examination/2000 Screening/Q019 expansion of ideal gas in three different paths Joint Entrance Examination/2000 Screening/Q004 Roatting triangular frame with beads, what quantities are conserved |
Browse All Available Categories :
| Physics: | Introductory Physics • Mechanics • Heat • Waves and Oscillations • Electricity And Magnetism • Optics • Modern Physics |
| Mathematics: | Algebra • Trigonometry • Co-Ordinate (Analytical) Geometry • Calculus • Vectors And 3D Geometry • Miscellaneous Topics |
| Chemistry: | General Chemistry and Physical Chemistry • Organic Chemistry • Inorganic Chemistry |
| Biology: | General Biology • Anatomy • Physiology • Botany • Zoology |
| a | a |
| Physics Introductory Physics Joint Entrance Examination/2000 Screening/Q013 Dimensional analysis User:Thewinster/HHF/Introductory-Physics-Preload Mechanics Joint Entrance Examination/2000 Screening/Q028 Ball dropped from a height, graphs Joint Entrance Examination/2000 Screening/Q004 Roatting triangular frame with beads, what quantities are conserved Heat Joint Entrance Examination/2000 Screening/Q007 Monoatomic Ideal Gas and a frictionless piston Joint Entrance Examination/2000 Screening/Q010 Intensity versus wavelength graphs of blackbodies Optics Joint Entrance Examination/2000 Screening/Q014 Intermediate image in a compound microscope Joint Entrance Examination/2000 Screening/Q016 Effect of changing width of slits on interference pattern Electricity And Magnetism Joint Entrance Examination/AIEEE 2009/Q084 work done by electrostatic field User:Thewinster/HHF/Electricity-And-Magnetism-Preload Modern Physics Joint Entrance Examination/2000 Screening/Q001 X Ray Tungsten filament and electrons Joint Entrance Examination/2000 Screening/Q025 Various energies of an electron in bohr model User:Thewinster/Sandbox User:Thewinster/Sandbox/Forum-Watch Joint Entrance Examination/2000 Screening/Q014 Intermediate image in a compound microscope Joint Entrance Examination/2000 Screening/Q019 expansion of ideal gas in three different paths Joint Entrance Examination/2000 Screening/Q004 Roatting triangular frame with beads, what quantities are conserved Joint Entrance Examination/2000 Screening/Q016 Effect of changing width of slits on interference pattern Joint Entrance Examination/2000 Screening/Q020 Melting of ice and evaporation - graph Joint Entrance Examination/2000 Screening/Q018 Spinning rod with a bead on it, time when it starts slipping Joint Entrance Examination/2000 Screening/Q021 Ionized gas subjected to electric and magnetic fields Joint Entrance Examination/2000 Screening/Q022 Radioactive materials and decay constant Joint Entrance Examination/2000 Screening/Q006 Bohr model of an atom applied to an atom with some hypothetical particle Joint Entrance Examination/2000 Screening/Q025 Various energies of an electron in bohr model Joint Entrance Examination/2000 Screening/Q023 capcitors and dielectric, equivalent capcitance Joint Entrance Examination/2000 Screening/Q027 Wind power turbine relation between wind speed and output power Joint Entrance Examination/2000 Screening/Q030 Hollow Double Convex Lens with variable liquids inside Joint Entrance Examination/2000 Screening/Q026 Ideal gas and graph of a process Joint Entrance Examination/2000 Screening/Q029 Coil of wire with conducting ring at centre and variable current Joint Entrance Examination/2000 Screening/Q005 Toppling vs Sliding of a cube Joint Entrance Examination/2000 Screening/Q031 Magnetic fields of parallel wires Joint Entrance Examination/2000 Screening/Q002 Uniform time varying magnetic field and induced electric field | Chemistry General and Physical Joint Entrance Examination/AIEEE 2009/Q006 Barium Nitrate Solubility Product Anionic foundation Joint Entrance Examination/AIEEE 2009/Q028 CHEMISTRY Joint Entrance Examination/AIEEE 2009/Q030 CHEMISTRY Inorganic Joint Entrance Examination/AIEEE 2009/Q002 Xenon Reactions Joint Entrance Examination/AIEEE 2009/Q005 chiral complexes Joint Entrance Examination/2000 Screening/Q038 Number of POP bons in cyclic metaphosphoric acid Joint Entrance Examination/2000 Screening/Q039 steel from haematite Organic User:Thewinster/Sandbox/20090221091454 User:Thewinster/Sandbox Joint Entrance Examination/AIEEE 2009/Q001neopentane IUPAC name User:Thewinster/Sandbox/Forum-Watch User:Thewinster/Sandbox Joint Entrance Examination/AIEEE 2009/Q001neopentane IUPAC name Joint Entrance Examination/AIEEE 2009/Q002 Xenon Reactions Joint Entrance Examination/AIEEE 2009/Q005 chiral complexes Joint Entrance Examination/AIEEE 2009/Q006 Barium Nitrate Solubility Product Category:General-And-Physical-Chemistry-Help Category:Organic-Chemistry-Help User:Thewinster/Sandbox/Forum-Watch Joint Entrance Examination/2000 Screening/Q041 order of reactivities in SN2 Joint Entrance Examination/2000 Screening/Q042 electronic configuration and predicting state Joint Entrance Examination/AIEEE 2009/Q003 Phenol, NaOH and CO2 Joint Entrance Examination/AIEEE 2009/Q004 Physisorption characteristics Joint Entrance Examination/2000 Screening/Q038 Number of POP bons in cyclic metaphosphoric acid Joint Entrance Examination/2000 Screening/Q039 steel from haematite Joint Entrance Examination/AIEEE 2009/Q023 number of isomers Joint Entrance Examination/2000 Screening/Q036 electrochemical cells simple question on potentials Joint Entrance Examination/2000 Screening/Q040 highest nucleophilicity Category:Inorganic-Chemistry-Help |
| Mathematics Algebra No pages meet these criteria. Trigonometry User:Thewinster/HHF/Trigonometry-Preload Co-Ordinate (Analytical) Geometry User:Thewinster/HHF/Mathematics/Analytical-Geometry-Preload User:Thewinster/HHF/Analytical-Geometry-Preload Calculus User:Thewinster/HHF/Calculus-Preload Joint Entrance Examination/AIEEE 2009/Q014 calculus Vectors and 3D Geometry User:Thewinster/HHF/Vectors-3D-Geometry-Preload Miscellaneous Topics Joint Entrance Examination/AIEEE 2009/Q047 Finding the Remainder User:Thewinster/HHF/Misc-Math-Topics-Preload User:Thewinster/Sandbox Category:Vectors-3D-Geometry-Help Category:Calculus-Help Category:Misc-Math-Topics-Help User:Thewinster/Sandbox/Forum-Watch | Biology What are the biology categories? You have to tell us, remember? User:Thewinster/Sandbox User:Thewinster/Sandbox/Forum-Watch |
Reply to the thread, posted by 164.100.170.4
Thread post
Additional notes
SOLUTION:[2]
As 4th bright fringe of unknown wavelength coincides with 3rd bright fringe of known wavelength
4Dλ/d = 3(590nm)D/d
λ= 3*590/4= 442.5 nm
These comments, along with the notes on the left, were contributed by 164.100.170.4 05:40, 24 September 2009 (UTC) :