Hertz's Observations

Q.

An external electric field is applied on a metal plate, high enough to force the electrons to eject out of the surface. Is this an example of Photo electric effect?

1. True

2. False

Q.

Why were electrons coming out from a metal when it was kept under a light source?

1. Light is an EM wave so when it falls on the metal surface its electric field pulls the electrons towards the source of light

2. Light is a form of energy. The free electrons in the metal when get sufficient energy from light, they jump out of the metal

3. Light has negative charge. When it falls on an electron it makes it more negatively charged and they jump out of the metal by repelling other electrons.

4. God told electrons "Thou shalt leave the metal, whenever light falls unto thee" and so they come out

Q. When the free electrons in the metal gets sufficient energy from a light source, they jump out of the metal.

1. True
2. False

Q.

Which of these models explain how the free electrons are present in a metal?

1. Plum pudding model Electrons are stuck in a positive sphere like plum in a cake

   

2. Solar system model

3. Electron sea model

4. Quantum mechanical model