How long would the noise remain in the jar for (it's airtight)? Where does the noise go if it doesn't stay in the jar?
2006-09-19 01:52:03 · 23 answers · asked by J C 3 in Science & Mathematics ➔ Physics
Sound in a jar isn't really a good example, since a good deal of the sound will pass through the jar.
A candle in a box of perfectly reflective mirrors would be a better example. The light would bounce back and forth within the box forever, even after the candle burned out - or at least until the box was opened and the light escaped.
In practice (real materials instead of theoretical materials), only some of the energy is reflected. Some of the energy is absorbed by the mirrors and turns into heat. Some of the energy could pass through the walls of the box allowing some light to escape completely (a lot of energy in the case of sound waves in a jar).
Each time the waves reflected, they would lose a little energy, meaning the frequency would drop. Considering the speed of light and the number of reflections that would take place, the light waves would quickly drop below the visible range of the spectrum, meaning no light. The same would happen to sound waves, as they would quickly drop below the range of human hearing.
2006-09-19 03:52:40 · answer #1 · answered by Bob G 6 · 2⤊ 0⤋
Noise is just the vibriation of particles. The sound would immediately dissipate into the glass of the jar and the surrounding air as a very small amount of heat caused by the increased vibration. The sound would never be trapped inside the jar at any point.
2006-09-19 08:55:06 · answer #2 · answered by DavidK93 7 · 0⤊ 0⤋
you stand behind a glass window. you still can hear what is happening outside. now the waves will reflect on the surfaces of the bottle and will "pass through it" with a certain attenuation. if you had a perfect reflecting medium you could have the wave bouncing for quite a long time and actually hear your voice once you re opened the bottle. the only energy lost would be due to the collisions that would take place.
now gimme a good reason to do such an experiment.
2006-09-19 09:03:01 · answer #3 · answered by Emmanuel P 3 · 0⤊ 0⤋
noise or sound is just waves of air. normally they travel quite fast about 300 ft per second so your shout has passed through jar and and partially reflected even before you closed your mouth. putting lid on it would be really late to do anything.
noise just passes through glass as waves and decipates into atmosphere. when you shout in jar you will feel the viberation of glass.
2006-09-19 19:44:08 · answer #4 · answered by ok 2 · 0⤊ 0⤋
LOL! I remember seeing a ventriloquist do that trick when I was about six and spending *hours* trying to duplicate it, much to my parents' amusement. The reality is that the walls of the jar are not perfect reflectors of sound, nor is the air a lossless transmitter of it, so the sound waves are quickly dissipated as heat.
2006-09-19 13:23:36 · answer #5 · answered by injanier 7 · 1⤊ 0⤋
No.
Assuming the jar is made of glass, sound travels well through glass. If the jar were made of a substance that does'nt carry sound well, then it would just be absorbed instead.
2006-09-19 08:56:07 · answer #6 · answered by slidehambidge 2 · 1⤊ 0⤋
No. But if you fart into a jar and seal it, the smell will remain for a while. Imagine the wife's surprise when she opened a jar of marmalade to discover a very eggy aroma!!!
2006-09-19 08:55:09 · answer #7 · answered by Anonymous · 1⤊ 2⤋
The sound energy would just change to another form such as heat energy. Sound is nothing more than vibrations. It would travel through the glass and would convert to another energy form.
2006-09-19 09:01:36 · answer #8 · answered by K 2 · 0⤊ 0⤋
Hmmm...even if you had some sort of container to trap the sound, you wouldn't be fast enough to screw the lid on anyway.
2006-09-19 09:00:29 · answer #9 · answered by Anonymous · 0⤊ 0⤋
The sound of your shout is immediate as you do it, so you wouldn´t have time enough to put the lid so quickly.
2006-09-19 08:56:28 · answer #10 · answered by Isadora 7 · 0⤊ 0⤋