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Why is the ratio of the velocities of li...

Why is the ratio of the velocities of light of wavelengths 4000 Å and 8000 Å in vacuum 1 : 1?

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Ratio of velocity of light `lamda = 4000 Å and 8000 Å` in vacuum is in ratio of 1:1, because veloicty does not depepnd of `lamda.`
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ICSE-SAMPLE QUESTION PAPER 5 -SECTION B
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  4. Name the factor that determines : Quality of the note.

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  5. Name the factor that determines : Pitch of the note.

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  10. The diagram in Fig. shows the displacement time graph of a vibrating b...

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  15. A lens forms an upright and diminished image of an object when the obj...

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  17. Name the principle on which fuse works.

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  18. To Which wire does the fuse is connected?

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