ASTR 111 Lecture Notes - Lecture 6: Photon, Atomic Number, Black Body

• School: George Mason University
• Department: Astronomy
• Course: ASTR 111
• Professor: Rebecca Ericson

Document Summary

When a photon interacts with an atom, what changes occur in the atom: the atomic number increases, the nucleus begins to glow, an electron changes its orbital, the photon becomes trapped in the orbit. How do radio waves differ from visible light: we hear radio waves with our ears instead of our eyes, radio waves have less energy, radio waves travel though space at a slower speed, all of the above. The intensity of light changes in the follwing way decreases as the square of the distance increases as the square of the distance decreases directly as distance increases increases directly as distance increases. Which of the following frequencies of light travels fastest? visible. X-ray radio ultraviolet they all travel at the same rate. Which frequency of light might be most useful for looking at a cool cloud of gas? radio gamma rays ultraviolet visible infrared. Which type of electromagnetic radiation has the longest wavelength: ultraviolet, visible, x-ray, infrared, radio.