Stanford Root

Schedule

Stanford Root

Schedule

PHYSICS 45

Light and Heat

UNITS:4
GRADING:Letter or Credit/No Credit
LEVEL:Undergrad
GER:WAY-SMA

What is temperature? How do the elementary processes of mechanics, which are intrinsically reversible, result in phenomena that are clearly irreversible when applied to a very large number of particles, the ultimate example being life? In thermodynamics, students discover that the approach of classical mechanics is not sufficient to deal with the extremely large number of particles present in a macroscopic amount of gas. The paradigm of thermodynamics leads to a deeper understanding of real-world phenomena such as energy conversion and the performance limits of thermal engines. In optics, students see how a geometrical approach allows the design of optical systems based on reflection and refraction, while the wave nature of light leads to interference phenomena. The two approaches come together in understanding the diffraction limit of microscopes and telescopes. Discussions based on the language of mathematics, particularly calculus. Physical understanding fostered by peer interaction and demonstrations in lecture, and discussion sections based on interactive group problem solving. In order to register for this class students must EITHER have already taken an introductory Physics class (PHYSICS 40 or PHYSICS 60 sequence) or have taken the Physics Placement Diagnostic at https://physics.stanford.edu/academics/undergraduate-students/placement-diagnostic.

Syllabus for selected term:
View Autumn 2026 Syllabus

Sections

1 Term
Lecture 1Open
ID: 7606
0 / 80 enrolled
DAYS:Monday, Wednesday, Friday
TIME:9 AM – 10:20 AM
LOCATION:Lathrop 018
4units
Lecture 2Open
ID: 26388
0 / 80 enrolled
DAYS:Monday, Wednesday, Friday
TIME:10:30 AM – 11:50 AM
LOCATION:Lathrop 018
4units

PHYSICS 45: Light and Heat

4 units · Letter or Credit/No Credit · GER: WAY-SMA

What is temperature? How do the elementary processes of mechanics, which are intrinsically reversible, result in phenomena that are clearly irreversible when applied to a very large number of particles, the ultimate example being life? In thermodynamics, students discover that the approach of classical mechanics is not sufficient to deal with the extremely large number of particles present in a macroscopic amount of gas. The paradigm of thermodynamics leads to a deeper understanding of real-world phenomena such as energy conversion and the performance limits of thermal engines. In optics, students see how a geometrical approach allows the design of optical systems based on reflection and refraction, while the wave nature of light leads to interference phenomena. The two approaches come together in understanding the diffraction limit of microscopes and telescopes. Discussions based on the language of mathematics, particularly calculus. Physical understanding fostered by peer interaction and demonstrations in lecture, and discussion sections based on interactive group problem solving. In order to register for this class students must EITHER have already taken an introductory Physics class (40 or 60 sequence) or have taken the Physics Placement Diagnostic at https://physics.stanford.edu/academics/undergraduate-students/placement-diagnostic.

Offered in Autumn 2026 at Stanford University.

Autumn 2026 sections

  • Lecture — Monday Wednesday Friday 9:00 AM – 10:20 AM — Lathrop 018 (Undergrad)
  • Lecture — Monday Wednesday Friday 10:30 AM – 11:50 AM — Lathrop 018 (Undergrad)

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