Physics
What is the wavelength of visible spectrum ?

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

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 0°C
Density of the substance to the density of water at 4°C
Density of the substance to the density of water
Density of water at 4°C to the density of the substance

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