A star is more stable in the main sequence phase than in the giant phase. True F

Question

A star is more stable in the main sequence phase than in the giant phase. True False The heat emitted by a protostar comes from fusion True False Brown dwarfs are an anomaly because they are extremely small but have relatively high temperature low mass M type stars with hundreds of planets protostars that could not ignite the fusion of hydrogen at their core has a surface temperature of 2500 K by fusing hydrogen stars with a very thick dust sphere around them, so they appear "brown" There is a mass-luminosity relationship because stars support their weight by generating energy, and more massive stars have more weight to support. True False All the elements heavier than helium on the periodic table, including the ones in your body, were created in the cores of massive stars True False

Explanation / Answer

question-4)

for the case of main sequence the the radiation pressure which are acted to the outwards of the star is approximately equal to the force of gravity. but for the case of giant sequence phase sequence, it is not possible. the net force may be act as it make a polarity of the forces. this make the star unstable and brust rather to make stable

=>so correct option is true

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question-5)

a protostar is a very young star which gathering mass from it's parents molecular clouds. the protosteller phase is the earliest state of the evolution of the steller evolutions. as the molecule cloud have a great charge over there. this chrges when colloid with the protosteller and make it to fusion to take place. this fusion process enable it to make the radiation as a heat energy.

=>so correct option is true

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questions-6)

brown dwarf are not extremely small star instead of that they have mass in such an order which fall in the catagory between the size of sun and jupiter. so option "a" is incorrect.

they are not so huge with small mass M with the star of combination of diffrent planets. instead of that they are the mass with which they fall in between the mass of sun and jupiter. so option "b" is also incorrect.

these are basically such types of protostar which cannot generate a such powerful ignition for fusion to take place in the core. so options "c" is correct.

it does not have the ability to ignite the fusion of hydrogen so the temperature will not be 2500k. so option "d" is incorrect.

it is not a dust sphere which look like brown . infact it actually have magneta colour .so option "e" is incorrect.

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question-7)

according to the mass-luminisity relationship, it is estimated that the mass is directly proportional to the energy produce in the core or center of the star. so star support their weight by generating more energy in their center by hydrogen fusion.

=>so correct option is true

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question-8)

star creat new element in their core by squeezing element together in a process called nuclear fussion. first star fuse hydrogen atom into helium. helium atoms then fuse to create other heavy elements.

=>so correct option is true

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