Find the speed for a star in which this line appears at wavelength 121.8 nmnm. Express your answer to three significant figures and include the appropriate units. How would you tell if the direction is away from or toward us?

Find the speed for a star in which this line appears at wavelength 121.8 nmnm. Express your answer to three significant figures and include the appropriate units. How would you tell if the direction is away from or toward us?

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter5: Radiation And Spectra

Section: Chapter Questions

Problem 30E: With what type of electromagnetic radiation would you observe: A. A star with a temperature of 5800...

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Concept explainers

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.

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Find the speed for a star in which this line appears at wavelength 121.8 nmnm.

Express your answer to three significant figures and include the appropriate units.

How would you tell if the direction is away from or toward us?

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