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Savatey [412]
3 years ago
11

Elements heavier than hydrogen are formed when light elements undergo nuclear fusion. Fusion takes place within stars at tempera

tures nearing 108K. Explain why this high energy is required for fusion to occur. A) High temperatures result in high kinetic energy that is converted to the nuclear binding energy. B) High temperatures result in the high kinetic energy needed to overcome the repulsive force of the two nuclei. C) High temperatures result in high kinetic energy that in turn creates a strong electrostatic force between the two nuclei. D) High temperatures result in the high kinetic energy needed to produce the strong force required to hold the nuclei together.
Physics
2 answers:
Gemiola [76]3 years ago
6 0

it would be B, Hight Temperatures result in the high kinetic energy needed to overcome the repulsive force of the two nuclei

LuckyWell [14K]3 years ago
3 0
B is the best answer.  Once the particles are sufficiently close, the strong nuclear force becomes stronger than the Coulomb repulsion and they are pulled together.  This results in bound particles that have a binding energy that can be retrieved of you can get the particles far enough away from one another after binding, but this requires large and unstable nuclei (beyond lead on the table)  These elements are referred to as radioactive, because they are prone to decaying
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An engine draws energy from a hot reservoir with a temperature of 1250 K and exhausts energy into a cold reservoir with a temper
dimulka [17.4K]

Answer:

The power output of this engine is  P =  17.5 W

The  the maximum (Carnot) efficiency is  \eta_c  = 0.7424

The  actual efficiency of this engine is  \eta _a  = 0.46

Explanation:

From the question we are told that

    The temperature of the hot reservoir is  T_h = 1250 \ K

      The temperature of the cold reservoir  is  T_c  =  322 \ K

     The energy absorbed from the hot reservoir is E_h  = 1.37 *10^{5} \ J

       The energy exhausts into  cold reservoir is  E_c  = 7.4 *10^{4} J

The power output is mathematically represented as

      P  =  \frac{W}{t}

Where t is the time taken which we will assume to be 1 hour =  3600 s  

W is the workdone which is mathematically represented as

      W =  E_h  -E_c

substituting values

       W = 63000 J

So

    P =  \frac{63000}{3600}

    P =  17.5 W

The Carnot efficiency is mathematically represented as

          \eta_c  =  1 - \frac{T_c}{T_h}

         \eta_c  =  1 - \frac{322}{1250}

         \eta_c  = 0.7424

The actual efficiency is mathematically represented as

        \eta _a  =   \frac{W}{E_h}

substituting values

         \eta _a  =  \frac{63000}{1.37*10^{5}}

         \eta _a  = 0.46

     

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