Page 1 of 1

### Threshold Energy

Posted: Thu Oct 11, 2018 3:29 pm
Can someone explain what the threshold energy in the photoelectric experiment is?

### Re: Threshold Energy

Posted: Thu Oct 11, 2018 4:47 pm
Threshold energy is the minimum amount of energy needed for the photon to remove an electron from the metal surface. It takes energy for the photon to remove the electron, and any less energy than needed (the threshold) would not eject an electron.

### Re: Threshold Energy

Posted: Thu Oct 11, 2018 6:17 pm
The threshold energy is a minimum amount of energy that a photon (think a packet of energy) has to reach to eject an electron from an atom of a certain metal. Threshold energy is determined by the type of metal, and different metals have different threshold energies for its atoms/electrons.

### Re: Threshold Energy

Posted: Thu Oct 11, 2018 6:28 pm
Basically, a metal's threshold energy is the minimum amount of energy that is needed an electron to be ejected from the metal. Each photon needs to have this energy in order for an electron to be ejected.

### Re: Threshold Energy

Posted: Thu Oct 11, 2018 8:42 pm
From my knowledge, the threshold energy is the minimum amount of energy it takes to remove one electron from the given metal, for each metal is different and requires a different threshold energy.

### Re: Threshold Energy

Posted: Thu Oct 11, 2018 11:28 pm
Threshold energy is the minimum energy needed to eject an electron from a metal surface. The energy of the photon minus the threshold energy should equal to kinetic energy of the electron. This should satisfy the Law of conservation of energy.

### Re: Threshold Energy

Posted: Fri Oct 12, 2018 12:09 am
Threshold energy is the amount of energy required to remove a single electron from a metal surface. Different metals have different threshold energies due to the difference in electronegativity. Each photon must have enough energy to remove an electron regardless of the amount of photons present in light. Intensity increases the number of photons, while frequency increases the energy of photons. Therefore, frequency has a direct effect on the removal of electrons from a metal surface.

### Re: Threshold Energy

Posted: Fri Oct 12, 2018 9:47 am
Threshold energy is the least energy needed to remove an electro of certain metal. Different metals have different threshold energy.

### Re: Threshold Energy

Posted: Fri Oct 12, 2018 10:10 am
Threshold energy is the amount of energy that is required to remove an electron from a metallic surface. The two main forces that determine how electrons will react to the photons of light are intensity and frequency.

### Re: Threshold Energy

Posted: Fri Oct 12, 2018 10:12 am
Threshold energy is the energy required in an experiment to remove an electron from a metal surface. Different metals will require different threshold energies. This energy will either be provided in the problem or be something that you must solve for.

### Re: Threshold Energy

Posted: Fri Oct 12, 2018 11:48 am
All above replies are correct

### Re: Threshold Energy

Posted: Fri Oct 12, 2018 3:24 pm
The threshold energy is the amount of energy required to bump an electron out of the metal plate that the light is hitting. It's the minimum amount of energy to rip the electron out of it's shell.