Mindtap Astronomy, 1 Term (6 Months) Printed Access Card For Seeds/backman's Foundations Of Astronomy, 14th
14th Edition
ISBN: 9781337399975
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 10, Problem 10P
To determine
The range of wavelength at which coronal gas gives maximum intensity of
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A cloud of gas has a temperature of 5,000 K.
Estimate the width of the hydrogen H-alpha line with an intrinsic wavelength λ = 656 nm.
(Note: the typical velocity of hydrogen atoms in a gas with temperature T is about (kT/mH)1/2, where k is Boltzmann constant and mH is the mass of a hydrogen atom, which is approximately the mass of a proton).
What is the wavelength in micrometers of peak emission for a black body at 33.5°C? (c = 3.0 × 108 m/s, Wien displacement law constant is 2.9 × 10-3 m ∙ K, σ = 5.67 × 10-8 W/m2 ∙ K4). Please give your answer with one decimal place.
Problem 3:
Two stars, M and N, from the same galaxy (at the same distance from
earth) are observed to have the same luminosity (that is, they emit the
same amount of energy per unit time). Star M is red, its spectrum peaks
2.4 × 1015s-1 while star N is white, its spectrum peaks at w =
3.6 x 1015s-1. Assuming that both stars radiate as black body, what is the
at w =
ratio of their radii?
Chapter 10 Solutions
Mindtap Astronomy, 1 Term (6 Months) Printed Access Card For Seeds/backman's Foundations Of Astronomy, 14th
Ch. 10 - Prob. 1RQCh. 10 - Prob. 2RQCh. 10 - Prob. 3RQCh. 10 - Prob. 4RQCh. 10 - Prob. 5RQCh. 10 - Prob. 6RQCh. 10 - Prob. 7RQCh. 10 - Prob. 8RQCh. 10 - Prob. 9RQCh. 10 - Prob. 10RQ
Ch. 10 - Prob. 11RQCh. 10 - Prob. 12RQCh. 10 - Prob. 13RQCh. 10 - Why is the ISM transparent at near-infrared and...Ch. 10 - Prob. 15RQCh. 10 - Prob. 16RQCh. 10 - Prob. 17RQCh. 10 - Prob. 18RQCh. 10 - Prob. 19RQCh. 10 - Prob. 20RQCh. 10 - Prob. 21RQCh. 10 - Name two processes (or objects) that remove...Ch. 10 - Prob. 23RQCh. 10 - Prob. 24RQCh. 10 - Prob. 25RQCh. 10 - Prob. 1PCh. 10 - Prob. 2PCh. 10 - Prob. 3PCh. 10 - Prob. 4PCh. 10 - The number density of air in a childs balloon is...Ch. 10 - Calculate the frequency in megahertz (MHz) of the...Ch. 10 - Prob. 7PCh. 10 - Prob. 8PCh. 10 - Prob. 9PCh. 10 - Prob. 10PCh. 10 - Prob. 1SOPCh. 10 - Prob. 2SOPCh. 10 - Prob. 1LTLCh. 10 - Prob. 2LTLCh. 10 - Prob. 3LTLCh. 10 - Prob. 4LTLCh. 10 - Prob. 5LTL
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- Assuming stars to behave as black bodies stefan-boltzmann law to show that the luminosity of a star is related to its surface temperature and size in the following way: L = 4(3.14)R^2oT^4 where o= 5.67 ×10^-8 Wm^-2 K-4 is the stefan- boltzmann constant. Then use this expression together with the knowledge that the sun has a surface temperature of 5700k and radius 695 500km to calculate the luminosity of the Sun in units of Wattsarrow_forward(a) The star Betelgeuse emits radiation with a peak wavelength of 807 nm. What is its surface temperature (in K)? (Assume the star behaves like a blackbody.) (b) The star Adhara emits radiation with a peak wavelength of 127 nm. What is its surface femperature (in K)? (Assume the star behaves like a blackbody.) Need Help? Read Itarrow_forward(a) The colour temperature can be determined from two magnitudes corresponding to two different wavelengths. Show that: 7000 K Te (B-V)+0.47 The wavelengths ofthe B and V bands are 440 nm and 548 nm, respectively, and we assume that B=V for stars of the spectral class A0, the colour temperature of which is about 15000 K°. (Take constant value - 0.73 and e-2.718).arrow_forward
- (a) For a black body, the temperature and the wavelength of emission maximum, Amax, are related AT= T = ( 1 ) ²₂ by Wien's law, , where c₂ = hc/k. (i) Write a simplified Wien's law expression in a form of an equation of straight line, (i.e., y = mx + c). (ii) Identify an independent variable and the slope/gradient from (i) above. (iii) Values of Amax from a small pinhole in an electrically heated container were determined at a series of temperatures, and the results are given below. Draw a graph and deduce a value for Planck's constant. T(°C) 1000 Amax(nm) 2181 1500 1600 2000 1240 2500 1035 3000 878 3500 763arrow_forwardWhat is the rate of thermal radiation emitted from a star with a radius of 2.310 x 109 m anda surface temperature of 8,420 K? Assume that the spherical surface behaves as a blackbody radiator.[Surface Area of a sphere = 4rr?: Area of a circle = Mr? or (Tt/4)d21arrow_forwardWhat is the rate of thermal radiation Emitted from a star with a radius of 2.310 x 10⁹m and a surface temperature of 8,420k? Assume that the spherical surface behaves as blackbody radiator .arrow_forward
- /dsinė A beam of electrons is shot towards a material X with a crystalline structure. A diffraction pattern is observed corresponding to a distance d=0.15 nm. between two adjacent Bragg planes. The electrons are each sent in with a kinetic energy of 51.900000000000006 eV. Part a) Find the de Broglie wavelength in nanometres of an electron incident on the material X.arrow_forwardA cloud of mean number density n ~ 3000 cm-3 and radius 3 pc has an ionising source with luminosity at 13.6 eV of L13.6eV = 2.18 x 109 erg s- at the centre. (a) What is the size of the HII region in pe? [og = 2 x 10-13 cms-]. %3D (b) What assumptions are involved in part a) (c) Discuss why the HII region will drive a shock into the rest of the cloud, and calculate the post-shock density. (d) Show why this HII region will destroy the cloud.arrow_forward(a) The star Dubhe emits radiation with a peak wavelength of 622 nm. What is its surface temperature (in K)? (Assume the star behaves like a blackbody.) answer in K (b) The star Deneb emits radiation with a peak wavelength of 340 nm. What is its surface temperature (in K)? (Assume the star behaves like a blackbody.) answer in Karrow_forward
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