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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
November 03, 2020 • 02:46 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Sir why b is in answer and what is meaning of option c
Which of the following properties can be determined from a spectrum of a star? (A) Surface temperature (B) Chemical composition (C) Speed perpendicular to my line of sight (D) None AB DB CD BC
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Sajan sarthak
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B is in answer because different chemical constituent have different capability of loose radiation in different spectral wavelength of EMR( electro magnetic radiation). and C defines that rotational or angular speed if you are at centre of star 🌟 orbit.
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Sajan sarthak Best Answer
A stellar spectrum can reveal many properties of stars, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements. Chemical composition can be determined from emission or absorption lines in the spectrum. Temperature can be measured based on the peak of the black body radiation, which ranges across a wide range of frequencies. Relative velocity can be measured by the red or blue shift of the emission or absorption lines. Apart from these three, the spectrum can be used to help determine: Density Mass Distance Luminosity One interesting factor is how much the emission lines or absorption lines are spread. This might indicate a surrounding protoplanetary disc or suchlike.