Physics
What is the wavelength of visible spectrum ?

1300 A°–3000 A°
8500 A° – 9800 A°
3900 A° – 7600 A°
7800 A° – 8000 A°

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Physics
Stars twinkle because

the refractive index of the different layers of the earth's atmosphere ch
None of these
the intensity of light emitted by them changes with time.
the distance of the stars from the earth changes with time.

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