Task:
1.If the surface temperature of a star is , then at what wavelength does the star emit the most light? What will be the color of this star and where will it lie on the H – R diagram?
2.If a star emits most of the light in . What is the temperature of the star Is this the surface temperature or core temperature of the star What will be the color of this star and where will it lie on the H – R diagram?
3.Consider two stars and of identical radius. If the temperature of two stars are and respectively. Then which star is more luminous and by how much
4.If the absolute magnitude and apparent magnitude of a star is and respectively. Calculate the distance to the star in light years
5.Consider two stars of identical luminosities. If the radius of the star is . What is the temperature of the star Temperature of the sun
6.Consider a red supergiant star Betelgeuse whose luminosities . If radius of Betelgeuse is . Calculate its temperature, if temperature of sun is , then at what wavelength does Betelgeuse emit the most light?
7.Consider two stars and with identical luminosities. If the radius of star is radius of star B, then what is the temperature of star compared to star
8.If the period of two Cepheid variable star and is 10 days and 4 weeks respectively. Then
a.Which star is intrinsically brighter? Explain
b.Which star is the farthest?
9.If the luminosity of a star is luminosity of star Then calculate the mass of star in terms of star .
10.Consider two main sequence star and . If life span of star is years and if star is . Then what is the life span of star What can you say about star and where will it lie on the H – R diagram?
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