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When α is absorbtivity, ρ is reflectivity and τ is transmisivity, then for diathermanous body, which of the following relation is valid? 
  • a)
    α = 1, ρ = 0, τ = 0
  • b)
    α = 0, ρ = 1, τ = 0
  • c)
    α = 0, ρ = 0, τ = 1
  • d)
    α + ρ = 1, τ = 0
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
When α is absorbtivity, ρ is reflectivity and τ is tran...
Relation for Diathermanous Body

Absorptivity, reflectivity, and transmissivity are the three properties that describe how a body interacts with electromagnetic radiation. In the case of a diathermanous body, which allows the passage of radiation, the following relation is valid:

C) Absorptivity = 0, Reflectivity = 0, Transmissivity = 1

Explanation

A diathermanous body is one that allows radiation to pass through it without significant absorption or reflection. This means that the absorptivity and reflectivity of the body must be zero. Transmissivity, on the other hand, measures the fraction of radiation that passes through the body. For a diathermanous body, this value must be equal to one since all the radiation that enters the body is transmitted through it.

Conclusion

In conclusion, the relation for a diathermanous body is that it has zero absorptivity and reflectivity and a transmissivity of one. This means that such a body allows radiation to pass through it without any significant absorption or reflection.
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Community Answer
When α is absorbtivity, ρ is reflectivity and τ is tran...
Diathermancy is the property of some fluids that allows rays through them without itself being heated. So for diathermanous body reflectivity and absorbtivity will become zero. That's why option C is correct.
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When α is absorbtivity, ρ is reflectivity and τ is transmisivity, then for diathermanous body, which of the following relation is valid?a)α = 1, ρ = 0, τ = 0b)α = 0, ρ = 1, τ = 0c)α = 0, ρ = 0, τ = 1d)α + ρ = 1, τ = 0Correct answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about When α is absorbtivity, ρ is reflectivity and τ is transmisivity, then for diathermanous body, which of the following relation is valid?a)α = 1, ρ = 0, τ = 0b)α = 0, ρ = 1, τ = 0c)α = 0, ρ = 0, τ = 1d)α + ρ = 1, τ = 0Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When α is absorbtivity, ρ is reflectivity and τ is transmisivity, then for diathermanous body, which of the following relation is valid?a)α = 1, ρ = 0, τ = 0b)α = 0, ρ = 1, τ = 0c)α = 0, ρ = 0, τ = 1d)α + ρ = 1, τ = 0Correct answer is option 'C'. Can you explain this answer?.
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