D860 General Physics II with Lab, catalog number PHYS 3000, is the four-CU course covering heat and thermodynamics, geometric optics and energy interactions in atomic and subatomic systems, with laboratory work attached. Three areas that look unrelated share one idea: energy moves between forms and places under rules that never let you get something for nothing. Students who carry that thread through the course find the second half far easier than students who treat thermodynamics, optics and atomic physics as three separate subjects.
One accounting problem in three disguises
Thermodynamics is bookkeeping with consequences. Energy added to a system either raises its internal energy or does work, and the split between those two is what every problem in the area is really asking about. Heat is energy in transit because of a temperature difference, not a substance a body contains, and students who keep saying that a hot object has more heat rather than more internal energy generate confusion that surfaces later in every entropy question. The second law adds direction: energy spreads, and the arrangements a system is overwhelmingly likely to occupy are the disordered ones.
Geometric optics is the same accounting done with light and geometry. Rays travel in straight lines until something changes their medium or direction, reflection sets the angle, refraction bends the path according to how the speed changes between media, and lenses and mirrors are devices arranged to make those changes useful. Almost every optics problem is solved by drawing two or three principal rays correctly, which is why students who insist on formulas first find the topic hard and students who draw find it mechanical.
The atomic and subatomic material closes the loop. Energy at that scale comes in steps rather than in a continuum, which is why atoms absorb and emit only particular wavelengths and why a spectrum is a fingerprint. Framing the section as what the classical picture cannot explain, discrete spectra, the photoelectric effect, the stability of the atom, makes an otherwise abstract topic follow from something you already believe.
Planning a four-CU course with laboratory work
WGU keeps the scoring detail inside your Course of Study rather than in the public catalog. Read it before you begin the practical work, because laboratory aspects usually specify what has to be recorded during the experiment and there is no reconstructing an observation you did not write down. Each aspect is scored on its own against a three-point scale, and a score of 2 in each aspect passes the task.
In a course that combines content and laboratory work, the practical planning question is where the hours go. A common and expensive pattern is to spend eighty percent of the time on problem practice and then improvise the reports, when the reports are what a rubric can actually score.
The word budget, worked. Suppose six scored aspects and directions asking for a report of roughly 2,000 words. Reserve 130 words for purpose and prediction and 110 for a conclusion, leaving about 1,760, or 290 an aspect. Then rebalance: the analysis aspect and the uncertainty aspect each take an extra 70 words, drawn 35 at a time from the materials and procedure aspects. Tables and graphs buy words back, provided each one carries a caption and a sentence saying what to notice.
The time budget, worked. Four competency units with laboratory work is commonly seventy hours or more. A workable split is thirty hours on problem solving across the three content areas, twenty on running and repeating experiments, and twenty on writing. Students who allocate nothing to the third block routinely discover that good data with a rushed report scores worse than adequate data with a careful one.
A structure that fits a physics II laboratory report
Where the task directions supply a template, use it exactly. Where they do not, this arrangement matches how physics laboratory aspects are usually scored.
| Section | What belongs in it | What earns the aspect |
|---|---|---|
| Purpose and prediction | The relationship under test and what theory predicts, written as a relationship | Scored for a prediction specific enough to be contradicted |
| Theory | The principle behind the prediction, in a short paragraph with the relationship stated | Scored for connecting the experiment to physics rather than to a procedure |
| Apparatus | Equipment with the precision of every measuring instrument | Makes the uncertainty section possible; missing precision is a return |
| Method | Steps in enough detail to repeat, including how each quantity was measured | Scored on reproducibility rather than on length |
| Data | All trials in labelled tables with units and consistent precision | Scored for recording what happened, including awkward values |
| Analysis | The plot chosen, the fit, the gradient and what it represents physically | The aspect that carries the report in optics and thermal work alike |
| Comparison | Measured value against accepted value with a quantified difference | Scored for making the comparison explicit |
| Uncertainty and conclusion | Named sources with size and direction, then a claim sized to the evidence | Scored for proportion; a single run supports a small claim |
In optics experiments, include the ray diagram you used to predict the result. It takes almost no space and it demonstrates the reasoning that a table of image distances cannot.
Evidence craft across thermal, optical and atomic work
This course generates three different kinds of data and each has its own failure mode.
- In thermal work, record ambient conditions. Heat losses to the room are the dominant error in most calorimetry, and an analysis that ignores them cannot explain the discrepancy it will certainly find.
- In optics, record distances from a defined reference point and say what that point is. Half of all optics discrepancies come from measuring to the wrong part of a lens or mount.
- Keep sign conventions explicit. Optics formulas depend on them, and a result with the wrong sign is a different physical situation rather than an arithmetic slip.
- State instrument precision once and respect it everywhere, including in derived quantities.
- Report every trial, including the one you doubt, with your reason for doubting it.
- Name error sources at the level of a step, with a plausible size and a direction, rather than writing about human error.
- Cite accepted values, constants and any protocol you adapted, in APA where your directions require it.
Where the practical work is simulated, the same standards apply and one more duty appears: say what the simulation does not model. An idealised environment with no heat loss and perfect alignment produces suspiciously clean data, and naming that limitation is a straightforward way to answer an aspect other students leave empty.
What separates Competent from a report sent back
Aspects score independently, so returns are usually narrow: an analysis that stopped at a number, or an uncertainty section with nothing specific in it.
- The prediction is derived from theory rather than asserted.
- Data appear as recorded with units and consistent precision.
- The chosen plot linearises the relationship where one exists.
- The gradient or result is interpreted as a physical quantity.
- The comparison with an accepted value is quantified.
- Error sources are specific, sized and directional.
Performance assessment work at WGU can be revised and resubmitted with no grade penalty, which matters in a laboratory course where the first attempt often exposes a procedural flaw. What a return costs is calendar time, and in a six-month flat-rate term the four-CU courses are the ones that decide whether the term finishes. Two limits hold on our side: where any part of the course is assessed by a proctored objective assessment we prepare only and never sit it, and we never run your experiment or supply data for submission, because the data are the assessment.
Six mistakes that cost time in D860
- Treating heat as a substance. Saying a body contains heat rather than internal energy leads directly to confusion in every entropy and transfer question.
- Skipping the ray diagram. Optics problems are geometry, and formulas applied without the drawing produce confident errors.
- Ignoring heat loss in calorimetry. It is the largest error source in the experiment and the one that explains almost every discrepancy.
- Mixing temperature scales. Gas law and thermodynamic relationships need absolute temperature, and the conversion is the most common single arithmetic failure in the course.
- Reporting one trial. Without repetition there is no way to separate a real effect from measurement scatter.
- Leaving the write-up to the end. In a four-CU course with laboratory work the reports are a third of the effort and all of the score.
How support works on this course
Send the task directions, the scoring detail from your Course of Study and your data once you have it. What comes back is a theory section that derives the prediction, a data layout with units and precision handled properly, an analysis that linearises where it should and interprets the gradient physically, and an uncertainty section built from your actual apparatus.
On the content side we work where the blockage actually is. For most students that is the first law and its sign conventions, or ray diagrams for lenses, or the step from continuous to quantised energy, and each of those is a couple of hours rather than a rebuild of the course.
The pacing advice is the same one that decides terms. Start the laboratory work in the first fortnight, not the last, because an experiment that fails needs calendar time to repeat and a compressed schedule cannot provide it.
Questions students ask about D860
Is D860 the same course as PHYS 3000?
Do I need General Physics I first?
Can you run the experiments or supply the data?
Thermodynamics, optics and a lab report at once?
Send your task directions and your data. You get a theory section that derives the prediction, an analysis that interprets the gradient and an uncertainty section with real sources.
Where D860 sits in WGU's programs
The July 2026 catalog places this code in 3 current WGU programs. Open a program page for the complete standard path and term positions. The live Degree Plan remains authoritative after transfer credit, substitutions, and mentor planning.
The assessments, one by one
The public catalog does not publish this course's PA/OA identity or task count. WGU Tutors publishes at most one PA manual per course and only from a WGU-controlled public rubric. Until that source exists, PA help begins from the student's real Course of Study and OA support remains preparation only.