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Q.

What is the rest energy of electrons?


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a

 510 KeV

b

 931 KeV

c

 510 MeV

d

 931 MeV 

answer is A.

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Detailed Solution

Concept: The generation threshold for electron-positron pairs is 1.02 MeV, which is higher than the rest mass energy of an electron of 0.511 MeV. This pair formation turns into one of the most significant types of interactions with matter for x-ray and gamma-ray energies well above 1 MeV.
Rest  energy of an electron = mec2
Here, me=9.1 X 10-31kg and c = velocity of light
Rest energy = 9.1 X 10-31 X (3 X 108) 2 joule
= 9.1 X 10-31 X (3 X 108) 21.6 X 10-19eV ≃ 510 KeV
Hence , option 1 is correct.
 
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What is the rest energy of electrons?