AS101 Lecture Notes - Lecture 11: Photon, Gamma-Ray Burst, The Moons
Document Summary
It is because the molecules in the air scatter blue light. The moon"s light is an example of reflection (off the sun) Plants reflects green light and absorbs other colors. Picture of sun (emission), t-shirt (absorption), dark astrophysical dust (absorption), window (transmission), blue area of nebula (scattering) light: wave or particle. Light behaves depends on how you treat it; it is both. Particle like i. e. camera"s wouldn"t work, ping pong balls being emitted. Wave-like i. e. bending of light through small gaps. Waves are any repeating motion that can carry energy without carrying matter along it (i. e. a crowd wave) Imagine a faucet dripping rhythmically into a filled bathtub (i. e. one drop per a second) Wavelength: the distance between the peaks (i. e. 10 cm) Frequency: number of peaks that pass by a fixed location in each second (i. e. 1 cycle/s or 1 hertz) Speed: of the waves: frequency x wavelength (i. e. 10cm/s) light as a wave.
