The atomic energy increases when an existing electron is removed from it. This is because work is required to be done to remove an electron. We call these Atomic Energy Levels.
The atomic energy levels of a hypothetical atom is given here
Ek
1000 ev
El
700 ev
Em
600 ev
En
550 ev
If an electron coming from the cathode (in a Coolidge tube set-up ) has to knock out an electron of L shell of the mentioned hypothetical atom, what should be the minimum accelerating potential of the setup ?
The atomic energy increases when an existing electron is removed from it. This is because work is required to be done to remove an electron. We call these Atomic Energy Levels.
The atomic energy levels of a hypothetical atom is given here
|
Ek |
1000 ev |
|
El |
700 ev |
|
Em |
600 ev |
|
En |
550 ev |
If an electron coming from the cathode (in a Coolidge tube set-up ) has to knock out an electron of L shell of the mentioned hypothetical atom, what should be the minimum accelerating potential of the setup ?
The correct option is C 700 eV
As EL=700ev. It means that to remove an electron from L shell the required energy is 700eV. Now the electron must have this minimum energy with it.
But the energy of an electron is eV (Where e is the electronic charge and V is the accelerating potential)
So,
eV = 700 eV
Which gives the value of the accelerating potential to be 700V.
700 eV
As EL=700ev. It means that to remove an electron from L shell the required energy is 700eV. Now the electron must have this minimum energy with it.
But the energy of an electron is eV (Where e is the electronic charge and V is the accelerating potential)
So,
eV = 700 eV
Which gives the value of the accelerating potential to be 700V.
