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Heat sinks are usually provided with black anodized finish to ___________

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Heat sinks are usually provided with black anodized finish to ___________

(a) Enhance heat dissipation by radiation

(b) Enhance heat dissipation by convection

(c) Prevent electrical connection

(d) Remove dust accumulation

I have been asked this question in an online interview.

My question is based upon Heat Sink for Power Transistor-2 in chapter Power Amplifier of Analog Circuits

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Right option is (a) Enhance heat dissipation by radiation

Best explanation: Heat sinks are usually provided with black anodized finish to enhance heat dissipation by radiation. Anodizing thickens and toughens the naturally occurring protective oxide layer on the metal surface. It provides dielectric isolation between cooling components and the electronics in the device.

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