Physics
Red is used as an emergency or danger signal as

Its wavelength is the longest
It is scattered
It has very high energy
It is a striking colour

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

To allow the aroma of the food to come out through the holes
To prevent the steam pressure from bursting open the pouch
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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