Question

Assertion :For higher temperature the peak emission wavelength of a black body shifts to lower wavelengths. Reason: Peak emission wavelengths of a black body is proportional to the fourth-power of temperature.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

According to Wein's displacement law
${\lambda }_{m}T=$constant
Naturally, when $T$ increases ${\lambda }_m$ decreases.
${\lambda }_m$ is peak emission wavelength and $E=\sigma T^4$
Here, $E$ is energy being radiated per unit area per unit time.