Light from a galaxy is passed through a diffraction grating. The diagram shows part of the emission
Question:
Light from a galaxy is passed through a diffraction grating. The diagram shows part of the emission spectrum.
The strong emission spectral line has wavelength 662 nm.
a. Calculate the energy of a photon of wavelength 662 nm.
b. Explain how a spectral line is produced by electrons within atoms.
c. In the laboratory, the same spectral line has wavelength 656 nm.
i. Calculate the speed of the galaxy.
ii. State the direction of travel of the galaxy.
d. State and explain what the wavelength of the same spectral line would be for a much more distant galaxy.
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Step by Step Answer:
a To calculate the energy of a photon you can use the formula E hc where h is Plancks constant 663 x ...View the full answer
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Related Book For 
Cambridge International AS And A Level Physics Coursebook
ISBN: 9781108859035
3rd Edition
Authors: David Sang, Graham Jones, Gurinder Chadha, Richard Woodside
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