Question

why is the colours of coal is black ???

Answer 1

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here is ur answer

Coal is fossilized lignin-rich plant tissues on the way to graphite, so it is worth observing what makes graphite black. Graphite absorbs across the entire visible and near infrared ranges, having a nearly wavelength-independent transmission of 1-πα per layer, where α=1/137 is the fine structure constant.

It rests on two key assumptions:

(i) The material is a 2D perioidic crystal. This is correct for graphite as the graphene layers interact weakly.

(ii) the occupancy number is Fermionic, which is also correct for graphene. Consequently, the transmission stays nearly constant between 500 and 1000 nm and decreases towards the blue.

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