Jump to content

Joint Entrance Examination/AIEEE 2009/Q076 WAVE OPTICS

From Wikiversity


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![1]



What's Up?

Latest discussions on the forum

Optics-Help

  1. Joint Entrance Examination/2000 Screening/Q014 Intermediate image in a compound microscope
  2. Joint Entrance Examination/2000 Screening/Q016 Effect of changing width of slits on interference pattern
  3. Joint Entrance Examination/2000 Screening/Q030 Hollow Double Convex Lens with variable liquids inside
  4. Joint Entrance Examination/2000 Screening/Q032 Divergent beam passsing from a glass slab
  5. Joint Entrance Examination/2000 Screening/Q033 Glass slab in water and total internal reflection


Physics-Help

  1. User:Thewinster/Sandbox
  2. User:Thewinster/Sandbox/Forum-Watch
  3. Joint Entrance Examination/2000 Screening/Q023 capcitors and dielectric, equivalent capcitance
  4. Joint Entrance Examination/2000 Screening/Q027 Wind power turbine relation between wind speed and output power
  5. Joint Entrance Examination/2000 Screening/Q030 Hollow Double Convex Lens with variable liquids inside



Browse All Available Categories

Physics: Introductory PhysicsMechanicsHeatWaves and OscillationsElectricity And MagnetismOpticsModern Physics
Mathematics: AlgebraTrigonometryCo-Ordinate (Analytical) GeometryCalculusVectors And 3D GeometryMiscellaneous Topics
Chemistry: General Chemistry and Physical ChemistryOrganic ChemistryInorganic Chemistry
Biology: General BiologyAnatomyPhysiologyBotanyZoology
a a


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)