EBK LOOSE-LEAF VERSION OF UNIVERSE
EBK LOOSE-LEAF VERSION OF UNIVERSE
11th Edition
ISBN: 9781319227975
Author: KAUFMANN
Publisher: VST
bartleby

Concept explainers

Question
Book Icon
Chapter 18, Problem 1CC
To determine

Whether the reason for describing the reddish H II region as red hot is the same that for the filament of an electric toaster.

Expert Solution & Answer
Check Mark

Answer to Problem 1CC

Solution:

The filament of an electric toaster is blackbody that is why it glows whereas the reason for the reddish H II region is the emitted light due to the transition from n=3 to n=2.

Explanation of Solution

Introduction:

The notation used by the astronomers for the neutral hydrogen atoms that are not ionized is H I and for the hydrogen atoms that are ionized is H II. The emission nebulae primarily consists of hydrogen atoms that are ionized, meaning free protons and free electrons.

Explanation:

A nearby hot star emits high energy ultra-violet photons which are absorbed by the hydrogen atoms in the nebulae. These hydrogen atoms gain energy to get ionized into electrons and protons. These free protons and free electrons recombine to form hydrogen atoms through a process known as recombination. When the hydrogen atom forms by recombination, the electron is usually captured in a large, energetic orbit of the proton. This electron makes a transition to successive lower energy orbits. With each transition, a photon is emitted and each of these photons are less energetic and have a longer wavelength than that compared to the photons emitted from a hot star initially. Among all of the transitions, the important transition is from n=3 to n=2 which results in Hα photons which lies in the red region of the visible spectrum, that is, with a wavelength of 656 nm.

The black bodies absorb the entire radiation incident on it and emit some other light carrying enough energy to maintain a particular equilibrium temperature. This implies every hot object glows by emitting the radiation. The filament of the electric toaster is also hot black bodies. This is the reason for the red glow of the electric toaster filament.

Conclusion:

The reddish H II region appears because of the emitted light in the red region of the visible spectrum.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
Example In Canada, the Earth has B = 0.5 mT, pointing north, 70.0° below the horizontal. a) Find the magnetic force on an oxygen ion (O) moving due east at 250 m/s b) Compare the |FB| to |FE| due to Earth's fair- weather electric field (150 V/m downward).
Three charged particles are located at the corners of an equilateral triangle as shown in the figure below (let q = 2.20 µC, and L = 0.810 m). Calculate the total electric force on the 7.00-µC charge.   What is the magnitude , what is the direction?
(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 9.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol.   (b) Imagine adding electrons to the pin until the negative charge has the very large value 2.00 mC. How many electrons are added for every 109 electrons already present?
Knowledge Booster
Background pattern image
Physics
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Stars and Galaxies
Physics
ISBN:9781305120785
Author:Michael A. Seeds, Dana Backman
Publisher:Cengage Learning
Text book image
Foundations of Astronomy (MindTap Course List)
Physics
ISBN:9781337399920
Author:Michael A. Seeds, Dana Backman
Publisher:Cengage Learning
Text book image
Stars and Galaxies (MindTap Course List)
Physics
ISBN:9781337399944
Author:Michael A. Seeds
Publisher:Cengage Learning
Text book image
The Solar System
Physics
ISBN:9781337672252
Author:The Solar System
Publisher:Cengage
Text book image
Astronomy
Physics
ISBN:9781938168284
Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher:OpenStax
Text book image
The Solar System
Physics
ISBN:9781305804562
Author:Seeds
Publisher:Cengage