21st Century Astronomy (fifth Edition)
5th Edition
ISBN: 9780393603330
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 15.1, Problem 15.1CYU
To determine
What happened to the visible light when it passes through the interstellar medium.
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A circular tablet with a radius of 20 cm and a uniform luminosity of 10.5 cd / m ^ 2 illuminates a small flat surface with an area of 1 cm ^ 2 and at a distance of 1 m from the center of the tablet. The orientation of this small surface is such that its perpendicular to the line joining the centers of the two surfaces forms an angle of 45 °. This line is perpendicular to the circular disk. Determine the luminous flux on a small surface
If a luminous object were moved to one-half the original distance, it would appear
a.
one-half as bright.
b.
just as bright.
c.
twice as bright.
d.
four times brighter.
e.
eight times brighter.
Chapter 15 Solutions
21st Century Astronomy (fifth Edition)
Ch. 15.1 - Prob. 15.1CYUCh. 15.2 - Prob. 15.2CYUCh. 15.3 - Prob. 15.3CYUCh. 15.4 - Prob. 15.4CYUCh. 15 - Prob. 1QPCh. 15 - Prob. 2QPCh. 15 - Prob. 3QPCh. 15 - Prob. 4QPCh. 15 - Prob. 5QPCh. 15 - Prob. 6QP
Ch. 15 - Prob. 7QPCh. 15 - Prob. 8QPCh. 15 - Prob. 9QPCh. 15 - Prob. 10QPCh. 15 - Prob. 11QPCh. 15 - Prob. 12QPCh. 15 - Prob. 13QPCh. 15 - Prob. 14QPCh. 15 - Prob. 15QPCh. 15 - Prob. 16QPCh. 15 - Prob. 17QPCh. 15 - Prob. 18QPCh. 15 - Prob. 19QPCh. 15 - Prob. 20QPCh. 15 - Prob. 21QPCh. 15 - Prob. 22QPCh. 15 - Prob. 23QPCh. 15 - Prob. 24QPCh. 15 - Prob. 25QPCh. 15 - Prob. 26QPCh. 15 - Prob. 27QPCh. 15 - Prob. 28QPCh. 15 - Prob. 29QPCh. 15 - Prob. 30QPCh. 15 - Prob. 31QPCh. 15 - Prob. 32QPCh. 15 - Prob. 33QPCh. 15 - Prob. 35QPCh. 15 - Prob. 36QPCh. 15 - Prob. 37QPCh. 15 - Prob. 38QPCh. 15 - Prob. 39QPCh. 15 - Prob. 40QPCh. 15 - Prob. 41QPCh. 15 - Prob. 42QPCh. 15 - Prob. 43QPCh. 15 - Prob. 44QPCh. 15 - Prob. 45QP
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- Within 2 minutes, 2 million photons of monochromatic green light are shone on a 3.2 x 10^-6 m^2 surface i) Find the intensity of the green light. ii) If half of the photons shone on the same surface for the same amount of time, contrast the intensity of light in both casesarrow_forwardObject A is hotter than object B. The light emitted from object A is (a) hotter than the light from object B (b) has a higher maximum wavelength than object B (c) has a lower maximum wavelength than object B (d) is cooler than object Barrow_forward( Why? From fireworks to stars, the color of light is useful in finding out what's in matter. The emission of g by hydrogen and other atoms has played a key role in understanding the electronic structure of atoms. Trace materials, such as evidence from a crime scene, lead in paint or mercury in drinking water, can be identified by heating or burning the materials and examining the color(s) of light given off in the form of bright-line spectra. Model 1 - White Light Lightbulb (white light) Prism Color Reds Oranges Yellows Greens Blues Violets Photon Energy (x 10-2¹) (J) 269-318 318-337 337-352 352-382 382-452 452-523 2. What happens to white light when it passes through a prism? Wavelength Range (nm) 625-740 590-625 565-590 520-565 440-520 380-440 Speed (m/s) 3.00 x 108 3.00 x 108 3.00 × 108 3.00 x 108 3.00 x 108 3.00 x 108arrow_forward
- Why is the sky blue? O Our eyes are not very sensitive to violet light. O The molecules and atoms in the atmosphere strongly scatter blue light. O The molecules and atoms in the atmosphere absorb all other wavelengths of visible light. O The molecules and atoms in the atmosphere are only transparent to bluc light. 0 * ... - .arrow_forwardA student wants to compare the luminous flux of a lightbulb with that of a 1750 lm lamp. The lightbulb and the lamp illuminate a sheet of paper equally. The 1750 lm lamp is 1.25 m away from the sheet of paper, while the lightbulb is 1.08 m away. What is the lightbulb’s luminous flux?arrow_forwarda The distance between A and B b The distance between A and D c The distance between midpoints D, E, and F d The light bands between D and E and Farrow_forward
- Define Visible rays.arrow_forwardState following statements whether TRUE or FALSE. i. We can see ordinary solid objects because light is refracted from them. ii. At room temperature the thermal radiation are in infrared region of the spectrum. iii. Our eyes are sensitive to ultraviolet light. iv. Upon heating, objects begin to emit visible light. Temperature of a piece of metal is increases; first it glow with deep red color and then it turns to yellow. V.arrow_forwardPetit sits in a 20°C dark room looking at a perfectly shiny metallic plate that has a temperature of 1000°C. Explain whether the plate emits visible light or not.arrow_forward
- The image shows the spectra of two objects, labeled 1 and 2. Which of the following statements is a correct interpretation of these spectra? Intensity 1 2 Wavelength object 1 is brighter than object 2 at all wavelengths O object 1 is blueshifted so it is moving toward us O object 1 is closer to us than object 2 O object 1 is redshifted so it is moving away from us O object 1 is blueshifted so it is moving away from usarrow_forwardWhich object is hotter? Object 1 at T = 30° Object 2 at T = 30° Object 3 at T = 30arrow_forwardGo outside on a clear night, wait 15 minutes for your eyes to adjust to the dark, and look carefully at the brightest stars. Some should look slightly red and others slightly blue. The primary factor that determines the color of a star is its temperature. Which is hotter: a blue star or a red one? Explainarrow_forward
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