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Black holes in orbit around a normal star are detected from the earth due to the frictional heating of infalling gas into the black hole, which can reach temperatures greater than $10^6 \mathrm{~K}$. Assuming that the infalling gas can be modelled as a blackbody radiator, then the wavelength of maximum power lies
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in the X-ray region
$: \lambda_m T=2.898 \times 10^{-3} \mathrm{mK}$
$\lambda_m=\frac{2.9 \times 10^{-3}}{10^6}=2.9 \times 10^{-9} \mathrm{~m}=2.9 \mathrm{~nm}$.Itliesinthe X-ray region of the electromagnetic spectrum.
$\lambda_m=\frac{2.9 \times 10^{-3}}{10^6}=2.9 \times 10^{-9} \mathrm{~m}=2.9 \mathrm{~nm}$.Itliesinthe X-ray region of the electromagnetic spectrum.
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