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Which of these surfaces is used for reentry vehicles at hypersonic speed?

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Which of these surfaces is used for reentry vehicles at hypersonic speed?

(a) Aluminum

(b) Carbon

(c) Ablative surface

(d) Copper

I had been asked this question in an online quiz.

I need to ask this question from Hypersonic Flow in portion Transonic and Hypersonic Flows of Aerodynamics

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Best answer
Right choice is (c) Ablative surface

The best explanation: The re – entry vehicles at hypersonic speed undergo viscous dissipation. This leads to rise in temperature within the boundary layer leading to excitation of the molecules causing dissociation or ionization. The surface of these vehicles are usually coated with ablative surfaces because of its high melting point and inert nature.

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