Physics
What is the wavelength of visible spectrum ?

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

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Physics
In the process of magnetisation of a bar

Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised
The entire bulk of the bar gets magnetised

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