Physics 2015-2016
The Electromagnetic Spectrum & Color (Sections 13-1 & 13-4)
1) (1 point) Write out the different portions of the electromagnetic spectrum in order from shortest wavelength to longest wavelength.
2) (2) Give two examples of or uses for each portion of the electromagnetic spectrum.
3) (2) A particular x-ray imaging device uses electromagnetic rays of about 7.5 x 1016 Hz. What is the distance between each individual wave for this radiation?
4) (2) Galileo performed an experiment to measure the speed of light by timing how long it took light to travel from a lamp he held to an assistant about 1.5 km away and back again. Why was Galileo unable to conclude that light had a finite speed?
5) (2) At its furthest point, Ceres, a dwarf planet in our solar system’s asteroid belt, is about 3x further away from the Sun than Earth is. If you were standing on Ceres at this time, how bright would the Sun appear to be as compared to how bright it would be from Earth?
6) (1) A lens for a spotlight is coated so that it does not transmit yellow light. If the light source is white, what color is the spotlight?
7) (2) A house is painted with pigments that reflect red and blue light but absorb all other colors. What color does the house appear to be when illuminated in white light? What color does it appear to be under red light?
8) (2) What primary pigments would an artist need to mix to obtain a pale yellow green color? What primary additive colors would a theater-lighting designer need to mix in order to produce the same color with light?
9) (1) Why would polarizing sunglasses remove the glare from your view of the hood or your car or a distant body of water but not from a tall, metal water tank?
10) (2) 3D movies are often shown by projecting two different images simultaneously. While the glasses you wear to watch seem to be perfectly clear, when you put them on, you see the two different images, one in each eye. How do these glasses work in conjunction with the projector?