Radiografic inspections.
what is the radiation contrast for lead if two thicknesses of 8.4 mm and 8.8 mm are used to measure it? assume that the attenuation constant for lead is 3.5 cm-1 and the build up factor is 2.0.
a characteristic curve for a particular brand of film shows the following values. what is the gradient, g, of this film?
optical density exposure/mgray
d1 = 1.6 k1 = 2.5 mg
d2 = 4.0 k2 = 4.3 mg
a film with a gradient of 12 has the following values. what would the exposure be at k2?
optical density exposure/mgray
d1 = 1.6 k1 = 2.5 mg
d2 = 4.1 k2 = ? mg

1. when conducting a test on what kind of music increases the growth of plants, all of the following would fail to meet to fair test standard except (1 point) using different kinds of plants. giving some plants more water than others. exposing the plants to different types of music. using nutrient-rich soil for one and lesser soil for others. 2. engineering uses scientific thinking to solve real-world problems. (1 point) true false 3. what does it mean to test a hypothesis? (1 point) pass a quiz on other scientists’ results analyze only the results from scientific sources not make assumptions about how an experiment will turn out see if the results of an experiment are what the scientist predicted