Experimental Design I. Distribute a measured amount of moistened sand in a tray

Question

Experimental Design I. Distribute a measured amount of moistened sand in a tray with a drain hole at the lower end. 2 Incline the tay 15°. Sprinkle 100 mL the tray using a watering can. Observe water onto the sand at the raised end of and record results. 3, Prepare another tray as in step 1 . 4. Incline the tray 30 Sprinkle 200 mL water onto the sand at the raised end of the tray using the watering can. Observe and record results 21. A student wants to investigate the effect of slope on erosion using the experimental design shown above. Which of the following suggestions will most likely improve the experimental design? (A) The student should use the same volume of water in step 2 and step 4. (B) The student should repeat the procedure with the tray laid flat and sprinkle 50 mL water onto the sand (C) The student should prepare the trays using dry sand instead of moistened sand (D) The student should use sand mixed with gravel in step 3 to minimize erosion of the sand in step 4

Explanation / Answer

A) The student should use the same volume of water in step 2 and step 4.

This is because the student here is trying to analyze the amount of erosion happening at different slopes. Therefore, only the slope must be changed, and not the amount of water. Otherwise, the student will be confused on whether the change is the erosion quantity was caused by slope change or water quantity change. Therefore, the volume of water must be same then the student can easily attribute the change in erosion quantity to change in slope.

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