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Work function of a metal
Minimum amount of energy needed by an electron to escape from a metal surface.
pd per division on an oscilloscope
Yield point
Point at which the stress in a wire suddenly drops when the wire is subjected to increasing strain.
Young's fringes
Parallel bright and dark fringes observed when light from a narrow slit passes through two closely spaced slits.
Young modulus
Stress/strain (assuming the limit of propotionality has not been exceeded).