IB Physics Glossary
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Ultrasound A-scan is an amplitude-modulated scan with information represented as a graph of signal strength against time. | |
Ultrasound B-scan is a brightness-modulated scan with information represented as levels of brightness. | |
Uncertainties • resulting from measurements are combined under the following rules: addition/subtraction of quantities => add absolute errors If ![]() ![]() multiplication/division of quantities = add relative/fractional/percentage errors If ![]() ![]() ![]() and ![]() ![]() If ![]() ![]() ![]() ![]() ![]() raising quantity to n'th power = multiply relative/fractional/percentage error by n If ![]() ![]() ![]() ![]() ![]() | |
Unified atomic mass unit (u)is 1/12th the mass of a neutral carbon-12 atom. | |
Uniform acceleration occurs when the acceleration ![]() Since acceleration is a vector quantity, constant implies a uniform magnitude and direction for the acceleration. The equations of uniform acceleration are ![]() ![]() ![]() ![]() where u is the initial velocity, v is the final velocity after time t, a is the acceleration and s is the displacement. | |