Experimental investigations show that the intensity of solar radiation is maximum for a wavelength $480 \, nm$ in the visible region. Estimate the surface temperature of the sun. Given Wien's constant $b = 2.88 \times 10^{-3} \, mK$.
- A$4000 \, K$
- B$6000 \, K$
- C$8000 \, K$
- D$10^6 \, K$
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