GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Rough
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Dull
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Shiny
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Brittle
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Detailed explanation-1: -Metals have a unique ability to reflect light from their pure surface (without impurities). This results in a shiny surface and this property is known as lustre.
Detailed explanation-2: -The correct option is D lustre. Metals have a unique ability to reflect light. This results in a shiny surface and this property of metals is known as metallic lustre.
Detailed explanation-3: -Metals are lustrous because of the free electrons they have. The free electrons can move freely in the metal causing any light incident on them to get reflected back. This reflection is specular reflection rather than diffused and thus the metal surface appears shiny or lustrous .
Detailed explanation-4: -Electrons on the surface can bounce back light at the same frequency that the light hits the surface, therefore the metal appears to be shiny.