Question

What is the rest mass energy of an electron?

Solution

Correct option is

0.51 MeV

    

         

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SIMILAR QUESTIONS

Q1

The ratio of the wavelengths of the longest wavelength lines in the Lyman and Balmer series of hydrogen spectrum is 

Q2

If a hydrogen atom at rest, emits a photon of wavelength , the recoil of the atom of mass m is given by

Q3

In an atom there are p photons, n neutrons and e electrons. For atoms of small mass, the relation between pn and e is   

Q4

Cal to protons ever attract each other?

Q5

How much energy is released when one amu is wholly converted into energy?

Q6

In the equation     

           ,  

The correct symbol for X is

Q7

The kinetic energy of a 300 K thermal neutron is

Q8

The energy released by the fission of one uranium atom is 200 MeV. The number of fissions per second required to produce 3.2 W of power is

Q9

The binding energy of deuteron  is 1.15 MeV per nucleon and an alpha particle  has a binding energy of 7.1 MeV per nucleon. Then in the reaction 

             

the energy Q released is 

Q10

After two hours  of the initial amount of a certain radioactive isotope remains undecayed. The half life of the isotope is