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Question:

what causes some materials to block out more sound than others?

The materials I am using are aluminum foil, wax paper, and plastic wrap, i found that aluminum foil blocks out the most soundWhy though?

Answer:

Sound waves are vibrations that travel through a medium by making the medium vibrateThe more solid a medium is the faster the sound travelsStopping sound , acoustics ,involves air spacesAcoustic tiles have little holes in themDrapes and curtains and rugs absorb sound.
In a baked potato they use a stainless steel nailBe sure it's stainless onlyIt's trueThe nail heats up faster( because its outside the core of the potato) and send the heat to the middle of the potato, making it cook faster and more evenlyAgain, make sure its stainlessOther metals can make you sick.
You don't leave the fork or knife in itIt means to poke holes with a fork or knife to help speed up the cooking time.
NO WAYiF YOU WAN'T A POTATOE FILLED WITH METAL OK.OTHER THAN THAT DON'T STICK A FORK IN POTATOE.ESPECIALLY NO FORK IN MICROWAVE WITH ANY FOOD OR THING
You can do an experiment with two potatoesBut I heard that you take a clean steal nail and stick it into the center of the potato Cook them the same period of time and see if there is any difference with the firmness of the insideBut I prefer eight minutes in the microwaveWithout a nail, of course.

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