Consider an opaque body capable of absorbing blue light and illuminated by (a) white light and (b) magenta light. What will be its color for each case?
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Consider an opaque body capable of absorbing blue light and illuminated by (a) white light and (b) magenta light. What will be its color for each case?
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- The atmosphere of Jupiter is more than 1000 km thick. From the surface of Jupiter, would you expect to see a white Sun?The explanation given in your textbook for the color of the setting Sun should apply equally well to the rising Sun, since sunlight travels the same distance through the atmosphere to reach your eyes at either sunrise or sunset. Typically, however, sunsets are redder than sunrises. Why? (Hint: Particles of all kinds in the atmosphere contribute to scattering.)You are in a room lit only by yellow light. A pillow in that room looks red you. (your eyes red + green light as yellow, your eyes see red + blue light as magenta; your eyes see green and blue light as cyan) a) What colors of light is the pillow reflecting in the yellow room? What colors of light is the chair absorbing in that room? Explain b) You then move the pillow into a room lit only by blue light. The pillow now looks blue. What colors of light is the pillow reflecting now? What colors is it absorbing? Explain c) What color will the pillow be in the sunlight? explain с 8 09 F6 F7 F11 0 F5 % 5 T G 6 Y H & 7 J F8 * 8 | F9 K 9 F10 L P F12 PrtSc + 11 Ins
- (A) Show a model as to how white light interacts with a t-shirt that appears to an observer as red and white striped in terms of light wave absoprtion and reflection. (B) Make a model of what will happen when white light is shined through a blue and green filter stacked on top of one another. It will appear black because white light is absorbed but show this in a skectch.A student is sitting outside on a sunny day looking at a book with a blue cover. She is explaining to her friend how she can see the book cover as blue. She said: "I can see the book cover as blue because light from the sun travels in straight lines to the book. The white light from the sun contains red, green, and blue light. When it strikes the book cover, the blue light is reflected at equal angles, while the rest of the colors are absorbed in the book cover. The reflected blue light then enters my eye, and I see the book cover as blue." Evaluate her explanation to determine whether it is good or poor, by choosing one of the following responses: O It is problematic because the idea that "the white light from the sun contains red, green, and blue," is not correct. It is problematic because the idea that "mostly the blue light energies are reflected at equal angles," is not correct. It is good because all the ideas are correct scientific ideas, and none of the important ideas are…The color of the setting sun should apply equally well to the rising sun, since sunlight travels the same distance through the atmosphere to reach your eyes at either sunrise or sunset. Typically, however, sunsets are redder than sunrises. Why? (Hint: Particles of all kinds in the atmosphere contribute to scattering.)
- Photons with a wavelength of 579 nm in air enter a plate of flint glass with index of refraction n = 1.66. Find the speed, wavelength, and energy of a photon in the glass. HINT (a) speed (in m/s) (b) wavelength (in m) (c) energy (in J)A metallic sphere A of radius 'R' is completely enclosed by a metallic spherical shell 'B' (made up of same material) of inner radius '2R' and outer radius '4R'. Outer surface of B is highly polished and is perfectly reflecting. Inner surface of 'B' and outer surface of 'A' behave like black bodies. Initially A is emitting radiations of maximum intensity near wavelength 2 and B is emitting radiations of maximum intensity near wavelength 62. After sufficiently long time, both will emit radiations of maximum intensity corresponding 5. 19X E2. Find X. 31 to wavelengthWhat is the peak wavelength of a blackbody with a temperature of 9000 K? The index of refraction of bone is n = 1.55. What is the speed of light in bone?
- Integrated Tutorial In a science fiction story, a major character pilots his own spacecraft, which is propelled by a stellar sail. As shown in the figure (not drawn to scale) a stellar sail is a large reflecting sheet attached to a spacecraft, much like an ordinary cloth sail is attached to a boat. Light from the star reflects off the sail, exerting a force on the sail. In the story, the spacecraft is small, and the single passenger sits in a small capsule. The trip is a short one, and there are no facilities in the capsule for rest, exercise, or nourishment. So we estimate the mass of the spacecraft, including the passenger and the stellar sail, to be m = 7000 kg. We further estimate the area of the stellar sail to be A = 8000 m2. Say that the mass of the star is M = 8 M, and its luminosity is L = 2170 Le, where the subscript o stands for the Sun. The mass of the Sun and its luminosity are 1.99 x 1030 kg and 3.84 x 1026 w, respectively. Find an approximate expression for the net force…Q. 1. Light with an energy flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 30 cm², the total momentum delivered (for complete absorption) during 30 minutes is: (a) 36 x 10-5 kg m/s. (c) 108 x 104 kg m/s. (b) 36 x 104 kg m/s. (d) 1.08 x 107 kg m/s.To reduce the loss of light when reflected from the glass surface, the latter is covered with a thin layer of a substance, the refractive index of which is n '= sqrt (n), where n is the refractive index of the glass. At what minimum thickness d (min) of this layer will the reflectivity of glass in the normal direction be minimal for light with a wavelength λ?