A Substance Is Allowed to Diffuse Along a 10-Cm Length

question 82

Multiple Choice

A substance is allowed to diffuse along a 10-cm length of tubing filled with water.The cross section of the tube is 5.3 cm².If the diffusion coefficient is 5.0 × 10¯¹⁰ m²/s,and 6.5 × 10¯¹⁴ kg is transported along the tube in 16 s,what is the difference in the concentration levels of the substance at the two ends of the tube?

• A)3.9E-1 kg/m³
• B)4.3E-2 kg/m³
• C)1.5E-3 kg/m³
• D)8.1E-4 kg/m³

---

Definitions:

Test Statistic

A number derived from sample observations in a hypothesis test that determines if the null hypothesis should be refused.

Randomized Block

A design of experiment that aims to reduce variation from confounding variables by grouping them into blocks before randomly applying treatments within each block.

Analysis of Variance

A statistical method used to test the differences between two or more means by analyzing variance.

Matched Pairs

refers to a design in experiments where each case has a unique counterpart for comparison, minimizing variability.