Chemical Engineering Basics - Engineering

Q1:

Pick out the wrong statement.

A Reflectivity of gases is very low.

B Absorptivity for metals is very high.

C Reflectivity for non-conducting materials is low.

D Reflectivity of polished surfaces is very high.

ANS:B - Absorptivity for metals is very high.

The wrong statement is: "Absorptivity for metals is very high." Explanation: Absorptivity refers to the ability of a material to absorb electromagnetic radiation, such as light. For metals, the absorptivity is typically low, not high. Metals are known for their high reflectivity, meaning they reflect a significant portion of incident light rather than absorbing it. This property is why metals appear shiny and reflective. Therefore, the statement that "Absorptivity for metals is very high" is incorrect. Instead, it should be that absorptivity for metals is typically low.