Light was thought to have behaved as a electromagnetic wave
However light behaves both as a particle and a wave
c = λv
c = speed of light = 3.0 * 10^8 m/s
λ = wavelength (nm)
v = frequency (Hz)
Wave theory of light could not explain certain things
Photoelectric Effect
● Ejection of electrons by a particle of light
● Depends on the frequency of light
● Higher frequency means higher energy
Plank said energy is not continuous but discrete
Known as a unit of planck energy
Light is made of quants known as photons
E = hv
E = Energy of photon
h = Planck's constant
v = frequency of photon