The star Sirius is emitting radiation with the radiant intensity (energy emitted per unit area per second) of 1.2× 107W/m2 the colour of this star will be

Question

The star Sirius is emitting radiation with the radiant intensity (energy emitted per unit area per second) of 1.2× 107W/m2 the colour of this star will be (A) blue (B) yellow (C) green (D) red

Tardigrade Admin · Accepted Answer

: By Stefans law of radiation, R=σ T4 where σ =5.67× 10-8Wm-2K-4 or T4=(R/σ )=(1.2× 107/5.67× 10-8) or T=3814 text K The star at 3814 K will appear blue.

Q. The star Sirius is emitting radiation with the radiant intensity (energy emitted per unit area per second) of $1.2 \times 10^{7} W / m^{2}$ the colour of this star will be

blue

yellow

green

red

: By Stefans law of radiation, $R = σ T^{4}$ where $σ = 5.67 \times 10^{- 8} W m^{- 2} K^{- 4}$ or $T^{4} = \frac{R}{σ} = \frac{1.2 \times 10 ^{7}}{5.67 \times 10 ^{- 8}}$ or $T = 3814 K$ The star at 3814 K will appear blue.

Q. The star Sirius is emitting radiation with the radiant intensity (energy emitted per unit area per second) of 1.2×107W/m2 the colour of this star will be

blue

yellow

green

red

: By Stefans law of radiation, R=σT4 where σ=5.67×10−8Wm−2K−4 or T4=σR​=5.67×10−81.2×107​ or T=3814K The star at 3814 K will appear blue.

Q. The star Sirius is emitting radiation with the radiant intensity (energy emitted per unit area per second) of $1.2 \times 10^{7} W / m^{2}$ the colour of this star will be

: By Stefans law of radiation, $R = σ T^{4}$ where $σ = 5.67 \times 10^{- 8} W m^{- 2} K^{- 4}$ or $T^{4} = \frac{R}{σ} = \frac{1.2 \times 10 ^{7}}{5.67 \times 10 ^{- 8}}$ or $T = 3814 K$ The star at 3814 K will appear blue.