Physics
When an electric bulb breaks, there is an explosive sound. That is due to

The chemical reaction between the gases inside the bulb
The air outside rushing in to fill the vacuum inside the bulb
None of these
The compressed gases inside rushing out suddenly

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Physics
A white and smooth surface is

Good absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and bad reflector of heat
Bad absorber and good reflector of heat

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