Photoelectric effect

What did early experiments initially prove about the nature of light?

• Light is made of particles

• Light is made of waves

• Light is made of energy

• Light is made of both particles and waves

What happens when light hits a cable next to another cable?

• The cables emit light

• Electrons jump from one cable to the other

• The cables start to vibrate

• The cables change color

What was the big contradiction found in the photoelectric effect?

• It happened for all types of light

• It happened only in the dark

• It only happened for light of some wavelengths

• It did not happen at all

What concept did Einstein introduce to explain the photoelectric effect?

• Particle theory

• Energy packets

• Wave theory

• Wave packets or photons