Lecture04

Lecture04 - Previous Lecture Stellar Brightness Wave nature...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Previous Lecture – Stellar Brightness Wave nature of light c = f λ Spectrum: intensity as a function of wavelength Photometric filter system: UBVRI Luminosity, Flux, and Inverse-Square Law F = L / (4 π d 2 ) Thermal sources and the blackbody spectrum Wien’s law: λ max 1 / T Stefan-Boltzmann Law: L = 4 π R 2 σ T 4 Stellar spectral classification
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Light – Revisited Most, but not all, aspects of light fit a wave model Early in the 20 th century, physicists realized that a particleaspect was also required Einstein – photoelectric effect – 1905 Nobel Prize Particles of light are called photons photon energy: E = h f = h c / λ Planck’s constant (h): h = 6.6 x 10 -34 joule sec coloris related to energy blue light has higher energy photons
Background image of page 2
Atomic Structure Two component atom: nucleus and electrons held together by electric force structure analogous to solar system Nucleus – Sun Electrons – Planets Electric force – Gravity
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Atomic Structure (continued) Crucial difference: in atom orbits are quantized only certain orbits allowed orbit size is related to energy (like solar system) so energy is also quantized
Background image of page 4
Electrons can change energy levels exactlythe energy difference between the levels must be supplied (or removed) to move up (or down) electrons try to move to lowest energy levels possible
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/31/2012 for the course 750 110 taught by Professor Ericgawaiser during the Fall '10 term at Rutgers.

Page1 / 20

Lecture04 - Previous Lecture Stellar Brightness Wave nature...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online