EQ: WHAT IS SUNLIGHT?

Photon Absorption and Emission

Photon

Continuous stream of photons (light) emitted by energized vibrating electrons. Wavelengths of light depends on energy quantum of fall-back. Vibrating charges interact to make magnetic field too, so photons are electromagnetic (em) waves. All emitted wavelengths create em spectrum.

Kirchoff’s Laws

Emission and Absorption Line Spectrum for H

Emission lines are the photons given off by specific electrons making specific fall-backs.

Continuous spectrum from solar fusion

Absorption lines from elements in solar “atmosphere” (photosphere and chromosphere)

Solar Radiation

Spectral analysis of light can indicate composition, temperature, and radial velocity of celestial bodies.

Local Group of galaxies (45) Milky Way

How did our Sun form?

The Solar “Furnace”

Fusion occurs in the core…

through the proton-proton chain reaction

Star temperature and size and size response to Fg collapse and outward fusion force.

H fusion at 15,000,000 K, T for He to fuse up to Fe in star cores.

Stellar evolution determined by initial mass of star

Hertzsprung-Russell (H-R) Diagram

H-R animation

H-R Hubble animation