What is geothermal energy ?

What is internal energy?

Define activation energy . What is threshold energy ?

What is mechanical energy ?

What is mean by the energy of a charged conductor ?

What is the ratio of energy of the ground state of hydrogen atom and energy of the first excited state of He^+ ion (Z=2) ?

What is activation energy ?

What is the unit of energy ?

The total energy of an electron in the first excited state of hydrogen atom is -3.4 eV . What is the potential energy of the electron in this state ?

The Ground state energy for Hydrogen atom is -13.6eV :What will be the energy require to Shift that e^- to the first excited state?