Experiment ot show that sound needs a medium in which to travel. When air in jar is in normal state the bell is audible. When air is evacuated no sound is heard. From ''Sound'' by John Tyndall, London, 1867. Photo by: .
px | px | dpi | = | cm | x | cm | = | MB |
Details
Creative#:
TOP14223752
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
No
Property Release:
No
Right to Privacy:
No
Same folder images: