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Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.
R. (monochromatic emissive power) Vs λ( graph for the surface at a
given temperature is scaled down version of the graph for black body at same temperature.
S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.
- a)Q
- b)R
- c)S
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which of the following statements is false regarding spectral distribu...
A grey surface is one for which monochromatic emissivity ελ is independent of wavelength (λ ) But total emissivity (ε) of a surface is given as
ε = E/Eb
Where E & Eb represent total emissive power of the surface and a black surface at same temperature.
But as ελ ≠ f(λ)
∴ ε = ελEb/Eb
∴ ε = ελ
i.e. total emissivity is equal to monochromatic emissivity. Hence statement Q is also correct.
In the figure shown,
AB = Eλ &
AC = Ebλ
∴ AB\Ac = Eλ/Ebλ
i.e, AB\AC = ελ
i.e. ratio of line segment AB and AC is monochromatic emissivity for surface corresponding to wavelength (λ) But as (ελ≠f(λ))
this ratio is same for all λ
i.e, A1B1/A1C1 = AB/AC = A2B2/A2C2
Thus graph of grey surface is simply scaled down version of graph of black surface. This also suggests that corresponding to maxima point for both surfaces is same.
Hence statement R & S are also correct.
Thus all statements are correct & option (D) is the correct answer.
Most Upvoted Answer
Which of the following statements is false regarding spectral distribu...
A grey surface is one for which monochromatic emissivity ελ is independent of wavelength (λ ) But total emissivity (ε) of a surface is given as
ε = E/Eb
Where E & Eb represent total emissive power of the surface and a black surface at same temperature.
But as ελ ≠ f(λ)
∴ ε = ελEb/Eb
∴ ε = ελ
i.e. total emissivity is equal to monochromatic emissivity. Hence statement Q is also correct.
In the figure shown,
AB = Eλ &
AC = Ebλ
∴ AB\Ac = Eλ/Ebλ
i.e, AB\AC = ελ
i.e. ratio of line segment AB and AC is monochromatic emissivity for surface corresponding to wavelength (λ) But as (ελ≠f(λ))
this ratio is same for all λ
i.e, A1B1/A1C1 = AB/AC = A2B2/A2C2
Thus graph of grey surface is simply scaled down version of graph of black surface. This also suggests that corresponding to maxima point for both surfaces is same.
Hence statement R & S are also correct.
Thus all statements are correct & option (D) is the correct answer.
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Community Answer
Which of the following statements is false regarding spectral distribu...
A grey surface is one for which monochromatic emissivity ελ is independent of wavelength (λ ) But total emissivity (ε) of a surface is given as
ε = E/Eb
Where E & Eb represent total emissive power of the surface and a black surface at same temperature.
But as ελ ≠ f(λ)
∴ ε = ελEb/Eb
∴ ε = ελ
i.e. total emissivity is equal to monochromatic emissivity. Hence statement Q is also correct.
In the figure shown,
AB = Eλ &
AC = Ebλ
∴ AB\Ac = Eλ/Ebλ
i.e, AB\AC = ελ
i.e. ratio of line segment AB and AC is monochromatic emissivity for surface corresponding to wavelength (λ) But as (ελ≠f(λ))
this ratio is same for all λ
i.e, A1B1/A1C1 = AB/AC = A2B2/A2C2
Thus graph of grey surface is simply scaled down version of graph of black surface. This also suggests that corresponding to maxima point for both surfaces is same.
Hence statement R & S are also correct.
Thus all statements are correct & option (D) is the correct answer.
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Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer?
Question Description
Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer?.
Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer?.
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Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Which of the following statements is false regarding spectral distribution of thermal radiation emitted by a grey surface P. Monochromatic emissivity is independent of wavelength Q. Total emissivity is equal to monochromatic emissivity.R. (monochromatic emissive power) Vs λ( graph for the surface at agiven temperature is scaled down version of the graph for black body at same temperature.S. The wavelength corresponding to maximum monochromatic emissive power is same as that of grey surface at same temperature.a)Qb)Rc)Sd)None of theseCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Chemical Engineering tests.
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