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| Experimental components |
Vacuum plate, electric bell, vacuum tube (need to bring your own vacuum pump or air pump) |
| Experimental process | (1) As shown in the figure, place the bell inside the glass cover and listen to the loudness of the bell. (2) Gradually pump out the air inside using a vacuum pump or manual air pump and listen to the change in the bell sound. (3) Gradually let air enter the glass cover and listen to the change in the bell sound. |
| Experimental phenomena | The phenomenon of experiment (2) is: the bell sound gradually becomes smaller and almost disappears. The phenomenon of experiment (3) is: the bell sound gradually recovers. |
| Experimental conclusion | Vacuum cannot transmit sound (or sound transmission requires a medium) |
| Additional analysis | The air inside the vacuum cover cannot be completely pumped out, and the experimental process can only approach the ideal vacuum state. By pumping out the air inside the vacuum cover, we can hear that the bell sound becomes smaller and smaller to infer that there is no sound in a vacuum state. This research method is called gradual approximation method. |
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We can provide technical support for your project while using our products. If you have any other custom requirements, you can also reach out to us, and our team will design solutions that meet your needs for physical experiments. Contact us.
If you encounter quality issues within the warranty period you will be covered. Every product has 1 Year warranty period .
In this case, we will usually offer you a refund or send a replacement as soon as the problem is confirmed. Sometimes you may need to ship the defective item back to us for free repair service or a new replacement. Customer should cover the return shipping fee, and labkitsforstudents.com is responsible for the shipping costs of arranging reshipment by air mail.
