Physics Glossary – Y

Yagi Aerial

Is a sharply directional aerial, the more rods or ‘elements’ it has, the better it can pick up the TV signal. A ‘Yagi’ aerial with between 10 and 18 elements is usually enough for good reception.

Youngs Modulus of Elasticity

Is the ratio of longitudinal stress and strain, named after British physicist Thomas Young.

Youngs Experiment (Double-Slit Experiment)

A double-slit experiment consists of letting light diffract through two slits producing fringes on a screen. These fringes or interference patterns have light and dark regions corresponding to where the light waves have constructively and destructively interfered. The experiment can also be performed with a beam of electrons or atoms, showing similar interference patterns; this is taken as evidence of the “wave-particle duality” explained by quantum physics.

Yield Point (Elastic Limit)

Maximum stress that can be applied before an object is permentantly deformed.

YAG (Yttrium Aluminum Garnet)

A widely used solid-state crystal which is composed of yttrium and aluminum oxides which is doped with a small amount of the rare-earth neodymium. Used to produce powerful laser Nd:YAG neodymium YAG lasers.

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