pls answer this qn..
Answers
Answer:
solution of stars
Evolution of a star means change in its
properties with time resulting in its passing
through different stages. We have seen that
the properties of the Sun have not changed in
the past 4.5 billion years. Stars evolve very
slowly for most of their life time. As stars are
continuously emitting energy, their energy is
constantly decreasing.
For their stability to remain intact i.e.
for maintaining a balance between the gas
pressrue and the gravitational force, it is
necessary that the temperature remains
constant. For the temperature to remain
constant, energy must be generated inside
the star. This generation of energy occurs
because of burning of fuel at the centre of the
star. The reason for the evolution of stars is
the burning of and therefore, the decrease in
the amount of fuel in their centre. When the
fuel in the centre finishes, the energy
generation stops. As a result, the temperature
of the star starts decreasing. Due to the
decrease in temperature, the gas pressure
decreses and the balance between gas
pressure and gravitatinal forece cannot be
maintained. As the gravtational force is now
higher than the gas pressure, the star starts
contracting. This causes another fuel to start
burning e.g. when hydrogen at the centre is
finished, helium starts undergoing fusion
and energy generation starts again. How
many fuels will be used depends on the mass
of the star
Life cycle of stars
Answer:
Option (a)
Explanation:
Suppression of speech, public communication, or other information.
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