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The alarm would be much quieter, as sound can't travel through vacuum. But if it's a mechanical alarm clock then vibrations would be transferred from the clock to the jar and then to whatever the clock is standing on , and you'd probably be able to hear some of that.
Sound is mechanical energy, and the energy of the sound is transferred into the medium through which it is travelling. As the energy of sound is carried by the medium, the vacuum of space will not support a sound wave.
The vacuum pump stops the sound waves from coming out. Because there are no particles to pass on the sound in a vacuum, we see the clock vibrating, but do not hear anything at all.
Sound can only travel through a medium (matter). Different materials allow sound to travel faster or slower. However, as an experiment put an electron bell in a bell jar. You hear it ring. Evacuate the bell jar of as much gas a possible ( a true vacuum is almost impossible to achieve in a Bell Jar), allow the bell to ring again. It will be much quieter, although the bell hammer will be vibrating at the same speed. By extrapolation, when all the gas is evacuated(vacuum) there will be no sound. So sound needs a medium to travel through.
Take an electric bell and hang this bell inside an empty bell-jar fitted with a vacuum pump (as shown in the following figure). Initially, one can hear the sound of the ringing bell. Now, pump out some air from the bell-jar using the vacuum pump. It will be observed that the sound of the ringing bell decreases. If one keeps on pumping the air out of the bell-jar, then at one point, the glass-jar will be devoid of any air. At this moment, no sound can be heard from the ringing bell although one can see that the prong of the bell is still vibrating. When there is no air present inside, we can say that a vacuum is produced. Sound cannot travel through vacuum. This shows that sound needs a material medium for its propagation.
The alarm would be much quieter, as sound can't travel through vacuum. But if it's a mechanical alarm clock then vibrations would be transferred from the clock to the jar and then to whatever the clock is standing on , and you'd probably be able to hear some of that.
yes, because the bell jar will vibrate
Sound is mechanical energy, and the energy of the sound is transferred into the medium through which it is travelling. As the energy of sound is carried by the medium, the vacuum of space will not support a sound wave.
The vacuum pump stops the sound waves from coming out. Because there are no particles to pass on the sound in a vacuum, we see the clock vibrating, but do not hear anything at all.
When the rubber sheet on a bell jar is pulled down, it creates a vacuum seal between the bell jar and the surface it is placed on. This vacuum seal allows for the removal of air from within the bell jar when connected to a vacuum pump, creating a vacuum environment inside the jar.
The vacuum inside the jar keeps the button down. On opening the jar, the vacuum is broken and the button pops up (and the lid can be clicked). Therefore, if the safety button is up, the vacuum seal has been broken and the contents of the jar may have been contaminated, and the contents may have gone off!
During packaging, a vacuum was created inside the jar, pulling the button in. When the jar is opened, the vacuum is released which allows to button to return to the "popped up" position.
A vacuum in a jar occurs when all air is removed from the jar, creating an absence of pressure. This creates a low-pressure environment inside the jar, which can have various scientific and practical applications like preserving food or conducting experiments that require a controlled atmosphere.
That sound cannot move through a vaccum.
Jars of peanuts, pickles, spaghetti sauce and others, are vacuum sealed at the manufacturing plant. That means that all the air is sucked out of the jar at the moment that the lid is screwed on. This is done to prevent bacterial growth. the whoosh sound we hear is the outside air rushing back into the jar when we open it for the first time. When we close the jar, there is always some air that stays trapped in the empty space under the lid. Since air is already present in the jar when we open it again, no air needs to rush in and no whoosh sound is produced.
Obtain a bell jar with a valve at the top, place the bell jar on a smooth flat surface. connect the valve to a vacuum pump through a rigid hose. Place a manual wind up spring alarm clock under the bell jar. Seal the bottom lip of the bell jar with petroleum jelly and ensure there are no gaps between the bell jar and the surface. Note the ticking of the clock. Start the vacuum pump and observe when the internal pressure begins to drop. Stop the vacuum pump and close the valve. Listen to the clocks ticking. Re start the vacuum pump and note the pressure drop, close the valve and listen to the ticking clock. As the pressure decreases the sounds of the clock will get fainter and fainter because there is less of the material medium (Air) to transfer the sound.
It's not under pressure (caused by gas) or in a vacuum. You should be concerned enough not to eat it if you hear a sound. The reason is that spoilage can give off gases.