Concept explainers
Speed of the star.
Answer to Problem 43GP
Speed at which star is receding from Earth is
Explanation of Solution
Given:
Balmer lines from singly ionized helium are overlapping with the Balmer lines from Hydrogen atom.
Formula used:
Wavelength from single-electron energy level transitions is inversely proportional to the square of the atomic number of the nucleus.
Calculation:
Considering wavelength equation for single-electron transitions, the Balmer lines have four times their usual wavelength due to red-shift. Now, using Doppler effect
Conclusion:
Thus, the speed at which star is receding from Earth is 0. 88c .
Chapter 33 Solutions
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