Respuesta :
Answer:
1. smaller objects cannot generate enough pressure to start hydrogen fusion.
2. 10,000,000
Explanation:
1. Stars are born in stellar nurseries known as nebula. A nebula is cloud of dust and gases. The disk of dust and gases when spins and gathers more and more mass, the temperature and pressure rises. If sufficient mass is gathered and right temperature and pressure is achieved fusion reaction starts and a star is born. Thus, smaller objects cannot generate enough pressure to start hydrogen fusion.
2. the core of a star must reach a temperature of 10,000,000 degrees Celsius for hydrogen fusion to begin.
Hydrogen fusion reaction in sun is:
[tex]_1^1\textrm{H}+_1^1\textrm{H}\rightarrow 1^2\textrm{H}+_{+1}^0\textrm{e}+\text{energy}\\\\_1^2\textrm{H}+_1^1\textrm{H}\rightarrow 2^3\textrm{He}+\text{energy}\\\\_2^3\textrm{He}+_1^1\textrm{H}\rightarrow _2^4\textrm{He}+_{+1}^0\textrm{e}+\text{energy}[/tex]
Overall reaction for the above series of reactions is given by:
[tex]4_1^1\textrm{H}\rightarrow _2^4\textrm{He}+2_{+1}^0\textrm{e}+\text{energy}[/tex]
There is a minimum mass for a body to be a star because the smaller objects are not able to generate enough pressure to initiate the hydrogen fusion.
The temperature of the core should be [tex]\boxed{10,000,000^\circ\text{ C}}[/tex] to initiate the hydrogen fusion.
Explanation:
The star is considered to be the source of energy for all the planets that move around it. The star of a system is comparatively massive than all other planets present in the system.
A body should have at least a threshold size in order to be categorized as a star. The star produces energy by means of the fusion of the hydrogen atoms and produce the nuclear energy. The production of this energy is initiated at a very high pressure on the gas present on the body.
The large size of the body exerts a huge amount of pressure on the gas present on the planet. therefore, the size of the planet plays an important role in determining whether a body will be a star or not.
Thus, There is a minimum mass for a body to be a star because the smaller objects are not able to generate enough pressure to initiate the hydrogen fusion.
The fusion of the hydrogen requires a very high temperature along with the high pressure. At very high temperature, the hydrogen atoms fusion with one another and produce a huge amount of energy.
Thus, The temperature of the core should be [tex]\boxed{10,000,000^\circ\text{ C}}[/tex] to initiate the hydrogen fusion.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Astronomy
Keywords:
minimum mass, star, smaller objects, energy, hydrogen fusion, generate, enough pressure, degrees, Celsius, 10,000,000 C.
