Energy -- usually in the form of light (or more generally, electromagnetic radiation).
photons
After 20 m all kinetic energy have been transformed to potential energy.Epot=m*g*h=0.15*9.81*20=29.4 Joule
Electrons are given energy because of the work done by the attractive or repulsive force, when they reach the place where they meet positive charges, they give off (release) their energy.
When an electron absorbs a photon, the energy it gains can cause it to change orbitals. The result is ionization. The electron can then emit a photon in the process of "falling back" into its original orbit. Note that electrons won't absorb a photon that cannot give them enough energy to reach a higher orbital. There are no "half measures" in this aspect of quantum mechanics as electrons cannot be shifted "half way" to the next higher orbital. The proof of the pudding here is that we can use lasers of a given frequency to stimulate the electrons in orbit around given atoms. By knowing how much energy a certain electron needs to move to the next higher orbital, we can tune our laser to that photonic energy. Then when we point our laser at a bunch of these atoms, we'll see a bunch of electrons being kicked up to higher orbitals and then emitting photons to return to their previous orbital. There is a bit more to this, but the essentials are here, and are a first step to understanding the subtle ways photons and electrons interact.
Kinetic energy is given by mv2, where m is mass and v is speed. To obtain a result let me divide the new kinetic energy, m(v/2)2 (where the initial velocity is divided by two), by the initial velocity, mv2. (v2/4)/v2 = 1/4 The kinetic energy will be one fourth of what it was when the speed is halved.
Among all the subshells present in a given shell, f-subshell has the highest energy.
Light.
energy is given out. this is emitted in the form light ie each atom has its own characteristic emission spectra.
It is given off
the external energy given to electrons,thier kinetic energy increases.thus electrons move from metal surface
Photons
orbital electrons
Two electrons of opposite spin
E=hv
Energy (in the form of photons) is given off when electrons in an atom fall to a lower energy level.
These electrons are called "valence" electrons. They are the ones that take place in bond formation.
it is its energy emitted by electrons while moving from higher energy state to lower one.
The number of electrons that are possible in a given energy level is given by the formula 2(n2), where n is the energy level. So you square the energy level and multiply times two. This gives you the electron capacity for that energy level. For example, the possible electron capacity for energy level 6 is 2(62), which is 2 x 36, which is 72. So the 6th energy level can take a maximum of 72 electrons.