Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To prevent the steam pressure from bursting open the pouch
To allow the aroma of the food to come out through the holes
To allow the heat to get into the food through the hole
To allow the microwaves to get into the food through the holes

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Physics
In a conductor

The valence band and the conduction band overlap each other
The forbidden energy gap is very narrow
The forbidden energy gap is very wide
There is no conduction band

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