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The 6563 Ã… H(alpha) line emitted by hyd...

The 6563 Ã… `H_(alpha)` line emitted by hydrogen in a star is found to be red-shifted by 15 Ã…. The speed with which the star is receding from the earth is

A

`17.3xx10^(3) m//s`

B

`4.29xx10^(7) m//s`

C

`3.39xx10^(5)`m/s

D

`2.29xx10^(5)`m/s

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-WAVE OPTICS-Assignment (Section-A (objective type question(one option is correct)))
  1. In Young's double slit experiment when two light waves form third mini...

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  2. It is believed that the universe is expanding and hence the distant st...

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  3. The 6563 Ã… H(alpha) line emitted by hydrogen in a star is found to be...

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  4. In the context of Doppler effect in light, the term red shift signifie...

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  5. A slit of width a is illuminated by white light. The first minimum for...

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  6. The bending of light about corners of an obstacle is called

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  7. Angular width (beta) of central maximum of a diffraction pattern on a ...

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  8. Red light is generally used to observe diffraction pattern from single...

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  9. When a compact disc is illuminated by a source of white light, coloure...

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  10. For what distance is ray optics a good approximation when the aperture...

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  11. To observe diffraction, the size of the obstacle

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  12. In a single slit diffraction pattem

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  13. Diffraction and interference of light refers to -

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  14. A polariser in used to

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  15. Light waves can be polarides as they are

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  16. Through which character, we can distinguish the light waves form sound...

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  17. The angle of polarisation for any medium is 60^(@) , what will be crit...

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  18. Which of the following cannot be polarised?

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  19. An unpolarised light of intensity Io is passed through a polaroid. The...

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  20. Refractive index of material is equal to tangent of polarising angle. ...

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