Question

At the time of total solar eclipse, Fraunhofer lines in solar spectrum appear as:
A.Black (dark) lines on a bright background
B.Bright colored lines on a dull background
C.Bright and dark bands
D.No spectrum is formed

Answer 1

Hint: Fraunhofer are named on the basics of the dark absorption lines in the spectrum of stars.

Complete step by step solution:
Before solving the question, we need to understand the meaning of Fraunhofer lines.
Fraunhofer lines are defined as any of the dark absorption lines in the spectrum of stars (like the Sun), which is caused by the selective absorption of a star’s radiation at points of specific wavelengths by the various gases that exist in the atmosphere between wavelengths ranging from 2,950 and 10,000 angstroms. Thus, Fraunhofer lines are indeed a lifeline to solar physicists. The depths of the absorption lines provide information about temperature, and the wavelength shifts of the lines tell us about the motion of the gas.
Thus, from the above information we can correlate that Fraunhofer lines in the solar spectrum appear as bright and dark bonds at the time of the total solar eclipse.
Therefore, the answer is option (c) i.e. bright and dark bands

Additional Information:
Fraunhofer lines were first observed by an English physicist William Hyde Wollaston in 1802 but were named after German physicist Joseph von Fraunhofer. Since 1814 more than 500 Fraunhofer lines were plotted and assigned by the brightest letters A to G, which is still in use today. Now more than 25,000 Fraunhofer lines are known to exist in our Solar System spectrum.

Note: Before being able to answer the sum students need to be able to comprehend the meaning of Fraunhofer lines and on what basis they are defined and what are the different types of these lines.