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101 Lecture Notes - Main Sequence, Carbon-12, Mnemonic

India

Physics

Banaras Hindu University - BHU

Out of the following main sequence stars which one has the coolest surface temperature.
<ol>
<li dir="ltr">
O-type 
</li>
<li dir="ltr">
B-type
</li>
<li dir="ltr">
G-type
</li>
<li dir="ltr">
K-type 
</li>
</ol>

Stars of which colour have the coolest surface temperature?

Measurement on two stars indicates that star X has a surface temperature of 5727 degrees Celsius and star Y has a surface temperature of the 11727 degree Celsius. If both the stars have the same radius, what is the ratio of the luminosity of the star Y to the luminosity of star X? Both stars can be considered to have an emissivity of 1.0.

101 Lecture Notes - Main Sequence, Carbon-12, Mnemonic

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