Question

The Planck distribution for a blackbody at different temperatures are shown in the figure below. The wavelength of visible lights is between 400 nm and 700 nm; the wavelength of infrared radiation is between 700 nm (near-infrared) and 1,000 micrometers (far- infrared). a. Assume that the tungsten filament in conventional light bulbs is a blackbody working at 3,000 K. It is emitting 100 W of thermal radiation. Calculate the amount (in Watt) of visible light and the amount of infrared radiation it emits.

          The Planck distribution for a blackbody at different temperatures are shown in the figure
below. The wavelength of visible lights is between 400 nm and 700 nm; the wavelength
of infrared radiation is between 700 nm (near-infrared) and 1,000 micrometers (far-
infrared).
a. Assume that the tungsten
filament in conventional light
bulbs is a blackbody working
at 3,000 K. It is emitting 100
W of thermal radiation.
Calculate the amount (in Watt)
of visible light and the amount
of infrared radiation it emits.

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The Planck distribution for a blackbody at different temperatures are shown in the figure
below. The wavelength of visible lights is between 400 nm and 700 nm; the wavelength
of infrared radiation is between 700 nm (near-infrared) and 1,000 micrometers (far-
infrared).
a. Assume that the tungsten
filament in conventional light
bulbs is a blackbody working
at 3,000 K. It is emitting 100
W of thermal radiation.
Calculate the amount (in Watt)
of visible light and the amount
of infrared radiation it emits.

Added by Lori H.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Supratim Pal

12/25/2022

Step 1

To calculate the amount of visible light emitted, we need to find the area under the Planck distribution curve between 400 nm and 700 nm. The Planck distribution formula is given by: B(λ, T) = (2hc^2 / λ^5) * (1 / (e^(hc / λkT) - 1)) Where: B(λ, T) is the Show more…

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The Planck distribution for a blackbody at different temperatures is shown in the figure below. The wavelength of visible light is between 400 nm and 700 nm, and the wavelength of infrared radiation is between 700 nm (near-infrared) and 1,000 micrometers (far-infrared). a. Assume that the tungsten filament in conventional light bulbs is a blackbody working at 3,000 K. It is emitting 100 W of thermal radiation. Calculate the amount (in watts) of visible light and the amount of infrared radiation it emits. T = 6,000 K λmax = 5000 K emax = 4000 K 3000 K 1.0 2.0 Wavelength (m)

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