
4 0 c m
34cm
actual image size: 26cm x 32cm
Description
This exhibit uses no special equipment and your voice is not amplified: the effect is caused by the precise shape of the dishes which reflect and concentrate your voice so that it can be 'beamed' acros a crowded room and heard on the other side. The curve of the dishes is part of a shape called a parabola. A parabola reflects soundwaves - or any other waves - in a special way.
Image Details
Image Ref.
10303825
© Science Museum / Science & Society Picture Library