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Time Period of Pendulum

Power of blac...

Question

Power of black body radiation versus wavelength for three different temperature is given below. Then select the correct option.

A

T_{1} = T_{2} = T_{3}

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B

T_{1} < T_{2} < T_{3}

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C

T_{1} > T_{2} > T_{3}

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D

T_{1} = T_{2} > T_{3}

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Solution

The correct option is C $T_{1} > T_{2} > T_{3}$
The Wien's displacement law states that black body radiation has different peaks of temperature at wavelengths that are inversely proportional to temperatures.

From Wien's displacement law,
$λ_{peak} T = constant$

$∴ λ_{peak} \propto \frac{1}{T}$

$∵ {λ_{peak}}_{1} < {λ_{peak}}_{2} < {λ_{peak}}_{3}$

$∴ T_{1} > T_{2} > T_{3}$

Why this question?

Tip:- Black body radiates lower wavelength at higher temperature.

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Time Period of Pendulum

Standard XII Physics

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