The angle of repose of sand-sized particles falling from the air is _____ degrees.
A) 14
B) 24
C) 34
D) 44
E) 90

Question

Quizplus · Accepted Answer

The angle of repose refers to the maximum angle at which a loose material, such as sand, can be piled up and still remain stable. The angle of repose for sand-sized particles is typically around 34 degrees. Therefore, choice C is the correct answer. Choices A, B, and D are unlikely based on what is commonly observed for sand, and choice E (90 degrees) is impossible because it would require the sand particles to be stacked completely vertically, which is not stable for loose materials.

The Angle of Repose of Sand-Sized Particles Falling from the Air