Physics Van 3-site Navigational Menu

Physics Van Navigational Menu

Q & A: A shield against sound.

Learn more physics!

Most recent answer: 05/09/2017
Q:
Is it possible to have total elimination / conversion / absorption of sound waves without the use of bulky composites, foams and wool material? Like a invisible shield that does not let sound wave enter the protected area.
why people cheat infidelity signs how many people cheat
cheater what to do when husband cheats wifes who cheat
the best android phone how to spy on cell phones phone tracking apps
internet drug coupons coupons for prescription medications prescription coupon
married woman looking to cheat My wife cheated on me most women cheat
types of abortions the weeks of pregnancy what happens when you get an abortion
abortion pill clinics abortion pill prices for abortions
discount card prescription damske.com print cvs
discount card prescription damske.com print cvs
rite aid prescription transfer coupon mesutcakir.com.tr coupon rite aid
levaquin pill internetsellout.com furosemide pill
levitra pill imitrex 25mg tadalafil pill
prescriptions coupons markthrice.com discount coupon for viagra
free viagra samples coupon gallaghermalpractice.com viagra 2016 coupon
prescription drugs coupons click viagra coupon card
1 wk pregnant abortion pill article on abortion
can i take minocycline with birth control read can i take minocycline with birth control
cialis coupon lilly blog.nvcoin.com transfer prescription coupon
prescription drug coupons cialis coupons from lilly drug coupon
prescription drug coupons codesamples.in drug coupon
drug discount coupons blog.suntekusa.com discount coupons for prescriptions
venlafaxine gewichtstoename idippedut.dk venlafaxine fk
diflucan 150 gruene-kehl.de diflucan sirup
flibanserin online flibanserin buy flibanserin buy
cialis open cialis walgreen coupon
buscopan hund go buscopan dragees
renovacija stanovanja blog.myexpensesonline.co.uk renova g
nurofen cold and flu dosage internetsellout.com nurofen plus dosage

- Seth (age 28)
Perak, Malaysia
A:

Hi Seth,

We already have invisible sound shields, of sorts. They are already available commercially: noise-cancelling headphones.

The principle is simple: measure the incoming sound wave, and broadcast (using standard speakers) the exact same wave, but out of phase. The waves superpose, or add up, as all waves do; since they are out of phase, they cancel exactly.

However, I'm pretty sure this could only work within a closed space, like headphones or an airplane cockpit.

If you wanted to shield something in free space, I think you'd need some sort of cloak made of bulky composites, as you said (see wikipedia: "soundproofing"). I can't think of anything which isn't somewhat bulky that reflects or absorbs a high percentage of sound.

Cheers,

David Schmid

why people cheat infidelity signs how many people cheat
hillcrest abortion clinic site live abortion video
best android spy spy on mobile how to spy on an android phone
cvs discount card click prescription drugs discount cards
cvs discount card cvs coupon online prescription drugs discount cards
discount card prescription go print cvs
rite aid prescription transfer coupon open coupon rite aid
online discount pharmacy dotnetblogengine.net coupon for prescription
online discount pharmacy dotnetblogengine.net coupon for prescription
prescription drugs coupons viagra manufacturer coupon 2016 viagra coupon card
viagra coupons free link drug coupons
pfizer coupons for viagra prescription coupon viagra discounts coupons
coupon for viagra viagra trial coupon viagra discount coupons online
1 wk pregnant d&c dilation and curettage article on abortion
can i take escitalopram in the morning link can i take escitalopram in the morning
prescription drug coupons cialis coupons from lilly drug coupon
drug discount coupons link discount coupons for prescriptions
claritinekombo warpedfish.co.uk claritine za psa
arcoxia 30 click arcoxia wiki
diflucan 150 gruene-kehl.de diflucan sirup
diflucan 150 gruene-kehl.de diflucan sirup
amlodipine 5 mg link amlodipine accord
nurofen cold and flu dosage internetsellout.com nurofen plus dosage
singulair 4 mg granulat scottdangelo.com singulair patient information
prescriptions coupons cialis coupon drug prescription card

(published on 06/26/2013)

Follow-Up #1: reducing noise

Q:
Acquaintance of mine living in Mt. Carroll, IL had a building next to his house convert to a tavern with rock band music on Friday and Saturday nights from the second story of this structure with open windows toward his bedroom. Tavern owner will not close the windows nor add insulation to the bare roof structure over the band. Sound levels are over 75 dB at his lot line. How can this noise be limited reasonably? Are you the best to answer this question?
- Jack Thorne (age 86)
Glen Ellyn, IL USA
A:

That does sound like a miserable situation. We probably aren't good people to give advice. Maybe a lawyer would be better.

The people in the house behind ours occasionally get very noisy. A thick stand of tall bamboo helped reduce the sound a bit. That takes a few years to grow, and even then can't be counted on to be thick every year. Maybe another reader will have a good idea.

Mike W.


(published on 05/09/2017)

Follow-up on this answer.