UNIVERSE (LOOSELEAF):STARS+GALAXIES
6th Edition
ISBN: 9781319115043
Author: Freedman
Publisher: MAC HIGHER
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Chapter 17, Problem 43Q
To determine
The absorption line in the Sun’s spectrum from strongest to weakest line.
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Students have asked these similar questions
1 Solar constant, Sun, and the 10 pc distance!
The luminosity of Sun is + 4- 1026 W - 4- 1033ergs-1, The Sun is located at a distance of
m from the Earth. The Earth receives a radiant flux (above its atmosphere) of F = 1365W m- 2, also known as
the solar constant. What would have been the Solar contact if the Sun was at a distance of 10 pc ?
1AU 1 1.5-+ 1011
a) The star 58 Eridani is a feint but naked-eye star similar to the Sun. Suppose that you are observing this star in the night sky without a telescope. Ignoring any interstellar extinction or atmospheric absorption, approximately how many photons per second arrive at your retina? Show all steps in your calculation. Look up any required information about the star using Wikipedia. Use sensible approximations so your calculation is straightforward. For example you could consider only the region of the spectrum where the photon flux peaks.
b) The Mid-Infrared Instrument (MIRI, camera and spectrograph) on the James Webb Space Telescope operates in the band 5 – 28 µm. For 58 Eridani, approximately how many photons per second can be used by this instrument? Assume that MIRI takes all the photons from the full JWST mirror. Show all steps in your calculation. Describe briefly two or three other factors which play a role in determining the sensitivity of an instrument such as MIRI?
Question.
Star A has a surface temperature of 4000 K while star B is 40,000 K on its surface. Assuming
that both have the same radius, indicate the statement that is true:
Answer.
O Star A emits more at infrared wavelengths than star B
The wavelength at which the emission of star B peaks is "redder" than the
corresponding wave- length for star A
O The radiation spectrum of star B peaks in the infrared range
None of the above
Chapter 17 Solutions
UNIVERSE (LOOSELEAF):STARS+GALAXIES
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