The 42nd Period | STEM Education Hub

📖Scenario

Sound from the band room is leaking into the library next door, and it's becoming a real problem — students in the library have complained they can hear rehearsal through the wall. Your job is to figure out how the sound is actually getting through, and propose a fix that a real school could afford to implement.

📊Reference Data & Standards

There's no clean data table for this one — you'll need to go observe the actual space (or a comparable shared-wall situation) and reason from what you find. Use these typical costs to build a realistic proposal.

Material / fix	Typical cost	What it actually does
Door sweep	$10–20	Seals the gap under a door — often the single biggest leak.
Weatherstripping (per door)	$15–25	Seals gaps around the door frame.
Mass-loaded vinyl (per 4×8 ft panel)	$70–90	Adds mass to a wall, reducing what passes through it.
Solid-core door upgrade	$150–300	Replaces a hollow door with a much denser one.
Acoustic foam panels (set of 12)	$50–70	Reduces reflection/reverb inside a room.
Heavy curtain (per door/window)	$30–60	Some absorption; minimal effect on transmission.
Carpet remnant (per room)	$100–150	Reduces in-room reverb; does not block a wall or door.

📏Constraints

Total materials budget: $250. Your itemized proposal must not exceed this.
Your fix must include at least one measure that addresses transmission (gaps, doors, or the shared wall) — not absorption alone.
Your diagnosis must identify a specific, plausible source of the bleed, not just 'the walls are thin.'
Costs must come from your Reference Data table or a comparable real source you cite.

🚚Deliverables

A written diagnosis identifying the most likely source(s) of the bleed and why.
An itemized proposed fix with a running total that fits the $250 budget.
A short explanation connecting each item in your fix to reflection, absorption, or transmission.

🧮Build Your Fix

Use this to draft your itemized proposal before writing it up formally.

💰 Your Itemized Fix

Total$0.00 / $250

✍️Written Diagnosis

In your notebook or a separate document, write:

What you think is the most likely source of the bleed, and why (cite what you observed).
How each item in your fix plan addresses that specific source — reflection, absorption, or transmission.
Why you rejected any tempting-but-wrong fixes (like "just add more foam").

📋Rubric

Criterion	Weight	What we're looking for
Diagnosis	30%	Identifies a specific, physically plausible cause of the bleed (gap, door, wall) rather than a vague guess.
Physics Reasoning	30%	Correctly distinguishes reflection, absorption, and transmission, and explains why the proposed fix addresses the actual problem.
Budget & Itemization	25%	Itemized costs are realistic, sourced, and fit within the $250 budget.
Communication	15%	Diagnosis and proposal are clear enough that someone unfamiliar with the room could follow the reasoning.

📤 Turn In

Written diagnosis identifying the likely source of the bleed
Itemized fix proposal, at or under the $250 budget
Explanation connecting each fix item to reflection, absorption, or transmission

← Back to Problem 3-2-1 Overview Review the Deep Dive →That's Unit 3 complete.