Electric bell inside an evacuated bell jar, illustration. This illustrates an experiment to show that sound requires air for propagation. The bell is allowed to ring while the air is evacuated from the bell jar. The ringing noise gets quieter until a vacuum is achieved, when it is silent even though the mechanism is working. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 4181 px × 4181 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |