AST 101 Lecture Notes - Lecture 15: Hitachi Maxell, Quantum Mechanics, Photon

• School: Syracuse University
• Department: Astronomy
• Course: AST 101
• Professor: Walter Freeman

Document Summary

Electric fields exert a force on electric charges. Magnetic fields exert a force on moving electric charges. Ja(cid:373)es clerk max(cid:449)ell suspe(cid:272)ted that (cid:862)(cid:272)ha(cid:374)gi(cid:374)g ele(cid:272)tri(cid:272) fields (cid:373)ake (cid:373)ag(cid:374)eti(cid:272) fields(cid:863) i(cid:374) (cid:1005)86(cid:1004)s. Changing electric field makes a magnetic field: which makes a magnetic field. Which makes an electric field further away. We can only perceive a piece of the sound spectrum d. We can only perceive a tiny fraction of the light spectrum d. Radio waves microwaves infrared uv xrays gamma (longer wl to shorter) We see that specific wavelength band (if-uv, rainbow) because it is the light that sun emits humans have evolved to see the colors of the sun. These electromagnetic waves have the same properties as water, sound, and string waves. Wavelength distance from one crest to the next. Frequency number of wave crests passing a given point per second. Light traveling thru empty space always travels at the speed of light c.