The dialogue of a text can help us learn a lot of things about the characters, including
the speaker's character traits, feelings, and motivations
the speaker's conflicts (internal and external)
the speaker's relationship with other characters
All of the above

The emissivity of the radiation shield is    

Explanation:

From the question we are told that

   The temperature of the first parallel plate is  

    The temperature of the second  parallel plate is  

    The  emissivity of first plate is  

    The  emissivity of first plate is  

Generally the total radiation heat that is been transferred without the shield is mathematically represented as

Where   is the Stefan-Boltzmann constant which has a value  

Substituting values

From the question we are told the that using the radiation shield would reduce the radiation heat transfer by 15%

  So the new heat transfer is

 So    

Now this new radiation heat transfer can be mathematically represented as  

   Where the emissivity of the  radiation shield and n is the number of radiation shield

Substituting values