Answer:
Kinetic energy, E = 9.1 eV
Explanation:
It is given that,
At the first excited state of a particular atom is 5.7 eV above the ground state. The kinetic energy of the atom after the collision is 3.4 eV.
We need to find the kinetic energy of the electron just before the collision. The conservation of momentum will be followed here. The energy gets transferred from moving electrons to these atoms is 5.7.
Let E is the kinetic energy of the electron just before the collision. It is equal to :
E = 5.7 eV + 3.4 eV
E = 9.1 eV
So, the kinetic energy of the electron just before the collision is 9.1 eV. Hence, this is the required solution.
I understand that electric field can exist without any magnetic field, although it is also generated by varying magnetic field, but as much I know, magnetic fields don't exist independently, they are generated by varying electric field or moving charge. Even in any magnetic substance, magnetic field is generated due to electrons orbiting the nucleus, and electrons have their own electric field, so electric field is present there as well.
Cemente and Rope are two of them hope this help please mark me as brainliest.
