0
When making ear defenders why do hey have a hard plastic outer case?
Wiki User
∙ 11y ago
Plastic (in conjunction with a couple of other materials) is a good choice for ear defenders for a number of reasons. First, it's tough and effective. It's also fairly cheap, readily available and easy to work with. Plastics come in a wide variety of types and with as wide a range of characteristics. Can anyone lookaround himself in a day and not see something made of plastic that is in use? Plastic is an excellent material from which to make ear defenders.
Rate This Answer
Wiki User
∙ 11y ago
Wiki User
∙ 15y agoBecause termites don't work? Foams contain gases. Transmission of sound requires compression. Compression of lots of little pockets of gas is lossy, which will deaden sound energy being transmitted. And plastics can be impervious to "ear wax", and not serve as a stable, easily cleaned, growth-retardant medium to protect the ears from infection.
Wiki User
∙ 14y agoRubber is good because it is has a lot of air bubbles in it. Sound takes a long time to travel through gases like air so rubber would be a good material to make ear defenders out of. Also some of the sound may reflect off the rubber.
Wiki User
∙ 11y agobeouse you need something hard to cover it
Wiki User
∙ 11y agoplastic is hard so when sound waves hit plastic the sound will reflect off them and if they reflect sound won't reach to your ear
Add your answer:
Earn +20 pts
What makes up a Car battery?
lead plates,acid,water and the outer plastic case
What is the meaning of breakdown in insulation in domestic wiring?
The outer plastic case on wire has got 2hot and gone all black hard an brittel
What is the plastic case?
A case made from plastic.
What defenders rifle is in a display case inside the shrine?
david crockett
Which defenders rifle is in a display case indside the Shrine in the Alamo?
jjjj
What This defenders rifle is in a display case inside the shrine?
david crockett
Why can metals such as copper and silver become charged by induction while plastic materials cannot?
Metals have one or two( or at the most three as in case of aluminium ) free electrons in outer orbit witch they want to give away to have saturated inner orbit so they become charged by induction. Plastic being carbon polymer have four electrons in outer orbit and does not want to give electrons or it will remain with only two electrons left as compared to six protons making it highly electrically positive. Plastic material cannot become charged.
What defenders rifle is in a display case inside the shrine of the Alamo?
David Crockett
What is a laptop made from?
Laptops are made of computer parts such as motherboards..processors etc.. as per the outer case. it differs. Some are made of plastic and some of metals like ionized aluminum.
What is a outer case of a battery made of?
Zinc
Why was the outcome of Dred Scott case considered a victory for defenders of slavery?
they abolished slavery and it was considered a victory
What is transmission case?
its the outer aluminum or steel case the surrounds the internal componrnts
