1B. The angle of impact for this bloodstain is:

Question

1B. The angle of impact for this bloodstain is:

BlackTom AI · Accepted Answer

Reiterating the question and the available choices helps set the stage for evaluation.
Question: '1B. The angle of impact for this bloodstain is:'
Options: 60, 6, 90, 30
Now, let's evaluate each option in turn, noting how the angle of impact relates to bloodstain shape.
Option 60: This option is plausible because, in bloodstain pattern analysis, the angle of impact (theta) is related to the stain's geometry by the sine relationship sin(theta) = width/length, where the width is the smaller dimension of the stain (across the trajectory) and the length is the longer dimension along the stain. A measured width-to-length ratio that corresponds to sin(60) = 0.866 would indicate an angle of impact around 60 degrees. Since the question asserts 60 as the answer, this option aligns with the typical method of using stain width-to-length ratio to infer theta, assuming the observed ratio matches that value.
Option 6: An angle of 6 degrees would imply an extremely elongated stain with a width very close to zero relative to its length, yielding a width/length ratio near sin(6°) ≈ 0.1045. In practice, such a tiny angle is uncommon in typical bloodstain patterns and would produce a highly elongated stain that may be difficult to distinguish clearly from other distortions. If the observed stain does not show such extreme elongation, this option would be inconsistent with the data.
Option 90: A 90-degree impact angle means the blood struck the surface perpendicularly, producing a roughly circular stain or a near-spherical footprint depending on other factors. If the stain in question is clearly elongated rather than circular, 90 degrees is not supported. This is a common pitfall: assuming perpendicular impact when the morphology is visibly elongated.
Option 30: An angle of 30 degrees corresponds to sin(30°) = 0.5, so the width-to-length ratio would be about 0.5. If the stain's measured ratio is significantly higher (closer to 0.866 for 60°) or significantly lower, the 30-degree interpretation would be inconsistent with the observed geometry. Without the exact measurements, this option is less consistent with an observed stain that matches a 60° geometry, and would be rejected if the data indicate a larger width relative to length.
In summary, the correctness hinges on the observed width-to-length ratio of the stain. The 60-degree option matches a ratio consistent with a relatively wide angle of impact compared to the others, whereas 6 and 30 imply markedly different ratios, and 90 implies a near-circular stain. The analysis favors 60 when the stain’s dimensions align with sin(theta) ≈ 0.866, but would refute the others if the measured ratios deviate accordingly.

ETX 020 001 WQ 2025 Assignment 1: Blood Spatter Analysis

1B. The angle of impact for this bloodstain is:

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