A block body is at a temperature 2880 K. The energy radiation emitted by this object with wavel

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A block body is at a temperature 2880 K. The energy...

A block body is at a temperature $2880 \mathrm{~K}$. The energy radiation emitted by this object with wavelength between $499 \mathrm{~nm}$ and $500 \mathrm{~nm}$ is $U_{1}$, between $999 \mathrm{~mm}$ and $1000 \mathrm{~nm}$ is $U_{2}$, and between $1499 \mathrm{~nm}$ and $1500 \mathrm{~nm}$ is $U_{3}$, then (Wien's constant $b=2.88 \times 10^{6} \mathrm{~nm}-\mathrm{K}$ ) (A) $U_{1}>U_{2}$ (B) $U_{2}>U_{1}$ (C) $U_{1}=0$ (D) $U_{3}=0$

A block body is at a temperature $2880 \mathrm{~K}$. The energy radiation emitted by this object with wavelength between $499 \mathrm{~nm}$ and $500 \mathrm{~nm}$ is $U_{1}$, between $999 \mathrm{~mm}$ and $1000 \mathrm{~nm}$ is $U_{2}$, and between $1499 \mathrm{~nm}$ and $1500 \mathrm{~nm}$ is $U_{3}$, then (Wien's constant $b=2.88 \times 10^{6} \mathrm{~nm}-\mathrm{K}$ )
(A) $U_{1}>U_{2}$
(B) $U_{2}>U_{1}$
(C) $U_{1}=0$
(D) $U_{3}=0$

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Key Concepts

Blackbody Radiation

Blackbody radiation refers to the electromagnetic radiation emitted by an idealized object that absorbs all incident radiation, regardless of wavelength. The spectrum of this emission depends solely on the temperature of the body, and it provides a fundamental basis for understanding thermal emission processes.

Planck's Law

Planck's law quantifies the spectral distribution of electromagnetic radiation emitted by a blackbody in thermal equilibrium. It describes how the energy output varies with wavelength and temperature, and is crucial for calculating the intensity of radiation over specific wavelength intervals.

Wien's Displacement Law

Wien's displacement law relates the temperature of a blackbody to the wavelength at which the emission is at its maximum. It is a fundamental principle that allows us to determine the peak wavelength for a given temperature, influencing how the spectrum is distributed in different wavelength regions.

Spectral Emission Bands

Spectral emission bands are specific, often narrow, ranges of wavelengths over which the energy radiation from a thermal source is measured or analyzed. Understanding emissions over narrow bands is important for comparing energy outputs and understanding the distribution of radiative power across the spectrum.

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