21st Century Astronomy And Learning Astronomy By Doing Astronomy (fifth Edition)
5th Edition
ISBN: 9780393613360
Author: Laura Kay, Ana Larson, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 5, Problem 5QP
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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.
What will be the effect on the spectral lines of an object if it is moving only perpendicular to your line of sight?
a.
They will be redshifted.
b.
They will be blueshifted.
c.
They will be split.
d.
They will be broadened.
e.
There would be no effect.
3. What is the longest wavelength EM radiation that can eject a
photoelectron from silver (A-4.73 eV; 1 eV = 1.6x1019 J).
4. If someone wanted to build a scale model of the atom with a
Chapter 5 Solutions
21st Century Astronomy And Learning Astronomy By Doing Astronomy (fifth Edition)
Ch. 5.1 - Prob. 5.1CYUCh. 5.1 - Prob. 5.2CYUCh. 5.2 - Prob. 5.3CYUCh. 5.3 - Prob. 5.4CYUCh. 5.4 - Prob. 5.5CYUCh. 5.5 - Prob. 5.6CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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- Go 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_forwardSuppose a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly goes supernova. Using data from Table 7.3: (a) By what factor does its power output increase? (b) How many times brighter than our entire Milky Way galaxy is the supernova? (c) Based on your answers, discuss whether it should be possible to observe supernovas in distant galaxies. Note that there are on the order of 1011 observable galaxies, the average brightness of which is somewhat less than our own galaxy.arrow_forwardIf one star has a temperature of 6000 K and another star has a temperature of 7000 K, h much more energy per second will the hotter star radiate from each square meter of its surface?arrow_forward
- 4. The wavelength of a distant star is observed to be 656.8 nm. In the lab, a similar type of star is modeled and should emit a wavelength of 121.6 nm. Using this data calculate the red-shift parameter.arrow_forward6. An object with a temperature of 5,000 K emits an electromagnetic (EM) flux of 50 nanowatt. Apply the blackbody radiation law to calculate approximate EM flux emitted by this body if its temperature is changed to 18,000 F.arrow_forwardThe Sun appears to be red as it sets because:1. Air absorbs red light less than other frequencies (i.e., acts like a red filter).2. The sunlight has a red shift when you're moving fastest away from it.3. The Sun cools down to 5000 K each evening.4. Light is refracted as it enters the atmosphere.5. The Sun dies in a glorious fireball each evening and is reborn each morning.6. None of the above.arrow_forward
- When two objects are far away, an observer moving will see a shift of the closest object relative to the farthest object. This shift is known as a.triangulation. b.parallax. c.a baseline. d.a degree. e.an arc second. What advantages do large telescopes have over smaller ones? a.larger collecting areas b.both superior angular resolution and less aberration c.superior angular resolution d.less aberration e.better exposure times What is the name given to a day which uses the stars as a reference? a.solar day b.diurnal day c.sidereal day d.orbital day e.none of the mentioned choicesarrow_forwardb) An incandescent lightbulb and a thin gas cloud are in space. An observer viewing with the perspective of the arrow in the attached diagram would see A. an absorption line spectrum. B. an emission line spectrum. C. a continuous spectrum. Reset Selection ple give explinationarrow_forward2.What is the speed of light in water (1=1.33) and in glass (1=1.5)? 3.What is the longest wavelength EM radiation that can eject a photoelectron from silver (A=4.73 eV; 1 eV = 1.6x10-19 J).arrow_forward
- What is the defining characteristic of a perfect blackbody? a. It looks black in ordinary white light. b. It absorbs all radiation incident on it. c. The temperature of a glacier increased over time. d. It has a surface temperature of absolute zero. e. It has a surface that reflects 50% of light evenly across all frequenciesarrow_forward2. Calculate the total intensity I=J, 1(2)d2 emitted at absolute temperature T from a blackbody using the 1 Planck radiation law I(2)=2xhc 1 Show that I has the form of the Stefan-Boltzmann law -1) I=oT* , and o=- 15c?h Compute the numerical value of ơ in SI units.arrow_forward3. Draw the black body spectrum, and indicate its main characteristicsarrow_forward
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