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Question

What is the translational kinetic energy of a Helium molecule (He) at 1500 K?


A

2.189 eV

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B

0.194 eV

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C

1.215 eV

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D

10.068 eV

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Solution

The correct option is B

0.194 eV


Helium, at such high temperature, is a good example of a monoatomic ideal gas. All its internal energy will only be translational kinetic energy, related to the temperature as -

Internal energy = kinetic energy =32KBT.

=32×1.38×1023×1500 J

=3.1×1020 J

=(3.1×1020)×(6.242×1018) eV

= 0.194 eV.


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