# Assessment Instructions: Problem Set 03 — Extinction, Reddening, and Dust Emission

## Inputs to Inspect
Student submission, this problem set, the solution key, the corresponding lecture slides/notes, and the referenced dataset(s) under `materials/ASTR360/data/`.

## Grading Standard
Award credit for correct method and units first, then for the specific numeric result. A student who shows correct reasoning with a small arithmetic slip should receive most of the available credit; a student with a correct-looking number but no visible derivation steps should not. Because this is a 300-level quantitative interstellar-medium course, full marks require a genuine derivation wherever the problem set asks for one, and a genuinely reasoned (not merely asserted) interpretation wherever the problem asks for scientific judgment (e.g., honestly characterizing an idealized model's disagreement with a real object).

## Problem-Level Criteria
- Problem 1: verify A_V=R_V E(B-V) arithmetic and the flux-ratio formula 10^(A_V/2.5).
- Problem 2: verify the student correctly compares total A_V (not just E(B-V)) between the two stars.
- Problem 3: verify the percent-error direction (underestimate) is stated correctly, not just the magnitude.
- Problem 4: verify the Wien's-law-like peak-shift direction is correct (warmer dust peaks at shorter wavelength).

## Resubmission Policy
Students may resubmit within one week of receiving feedback. A resubmission must show a corrected derivation, not only a corrected final number, and should reference the specific feedback comment it addresses. Regrade to a maximum of 90% of the original point value unless the error was a grading mistake.

## Common Errors to Flag
- Comparing E(B-V) alone instead of A_V=R_V E(B-V) when asked which star has greater total extinction.
- Sign errors in percent-error calculations (reporting an underestimate as an overestimate or vice versa).
- Confusing which SED (15 K or 50 K) peaks at shorter wavelength.