Physics, 07.05.2021 01:10 ramirezzairap2u4lh
A scientific technique can be used to determine the presence and concentration of a chemical compound in a sample. A light source is directed at samples of known concentrations and the amount of light each absorbs is measured. Based on the graph, which statement best describes the relationship between concentration and light absorption?
A. The light absorption of a sample is independent of the concentration of the chemical compound.
B. The concentration of the chemical compound in a sample remains steady as the light absorption increases.
C. An increase in the concentration of the chemical compound in a sample is accompanied by an increase in the light absorption.
D. A decrease in the light absorption of a sample is accompanied by an increase in theconcentration of the chemical compound.
Answers: 3
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Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22Β°c and leaves at 47Β°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.
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A scientific technique can be used to determine the presence and concentration of a chemical compoun...
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