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The focal length of a lens is the distance from the lens to the image.  

Schrödinger’s equation predicts the exact position of electrons.  

Specific heat is the heat needed to raise 1 kg of a substance by 1 oC.

Alternating current (AC) is used in homes because it is safer than direct current (DC).  

Potential energy is the energy of position.

Interference can result in both constructive and destructive patterns.  

A thermos bottle minimizes heat transfer by radiation.

Ultrasound frequencies are below 20 kHz and can be heard by humans.  

All elements have a stable isotope

Magnetic fields can exert forces on moving charges.