The maximum energy in thermal radiation from a source occurs at the...

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The maximum energy in thermal radiation from a source occurs at the wavelength \( 4000 \AA \). The effective temperature of the source is
[AMU (Engg.) 1999; WB-JEE 2010]
(a) \( 7000 \mathrm{~K} \)
(b) \( 80000 \mathrm{~K} \)
\( \mathrm{P} \)
(c) \( 10^{4} \mathrm{~K} \)
(d) \( 10^{6} \mathrm{~K} \)
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