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NEET 2006

Exam: NEET
Year: 2006
Subject: Physics
Chapter: Thermal Properties of Matter

NEET 2006 · Physics · Thermal Properties of Matter

A black body at 1227^ C emits radiations with maximum intensity at...

A black body at

1227^{\circ} \mathrm{C}

emits radiations with maximum intensity at a wavelength of

5000 Å

. If the temperature of the body is increased by

1000^{\circ} \mathrm{C}

, the maximum intensity will be observed at:

Options

A $3000 Å$
B $4000 Å$
C $5000 Å$
D $6000 Å$

Correct answer

A. $3000 Å$

Step-by-step solution

By wiens displacement law

\lambda_m

T=B UCwe have,

\begin{aligned} (5000)(1500) & =\lambda_m^{\prime}(1500+1000) \\ \Rightarrow \quad \lambda_m^{\prime} & =\frac{5000 \times 1500}{2500}\\ & =3000 Å . \end{aligned}

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