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When monochromatic light travels from on...

When monochromatic light travels from one medium to another, its wavelength changes, but its frequency remains the same. Why ?

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When light travels between medium, the wavelength must change by the same proportion as the speed of light.
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Statement-1: As light travels from one medium to another, thhe frequency of light doesn't change. Statement-2: Frequency is the characteristic of source.

XII BOARDS PREVIOUS YEAR-XII BOARDS-PHYSICS (Theory) [SET -I]
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  2. Define the term 'wattles current'.

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  4. Two large parallel thin plates having uniform charge densities + sigma...

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  5. Two small identical electrical dipoles AB and CD, each of dipole momen...

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  6. A magnetic needle free to rotate in a vertical plane parallel to magne...

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  7. Fig, shows two indentical capacitors C(1) and C(2) each of 1 muF capa...

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  8. Two convex lenses of same focal length but of aperture A(1) and A(2)(A...

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  9. Draw the output waveformed at X, using the given inputs A and B for th...

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  10. Name the semiconductor device that can be used to regulate an irregula...

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  11. How are infrared waves produced? Why are these referred to as 'heat wa...

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  12. Draw the tramsfer characteristic curve of a base biased transistor in ...

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  13. Define modulation index. Why is it generally kept less than one ?

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  14. A current is induced in coil C1 due to the motion of current carrying...

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  15. A conductor of length L is connected to a dc source of emf epsilon. If...

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  16. Using Gauss's law obtain the expression for the electric field due to ...

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  17. An electron and a photon each have a wavelength 1.00 nm. Find (i) ...

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  18. Draw a schematic diagram showing the (i) ground wave (ii) sky wave and...

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  19. Describe Young's double slitexperiment to produce interference pattern...

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  20. (a) Describe briefly, with the help of suitable diagram, how the tran...

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