Physics - Electromagnetic Radiation

Waves , Sound and Light

Photon

A packet of energy found in light

EMR’s are

Transverse waves

Propagation of EM waves

an accelerating charge produces an oscillating magnetic field in one plane , which produces an oscillating electric field in a plane 90° to it

These oscillating fields are

Mutually generating which is why they do not need a medium to travel through and can thus travel through a vaccuum

EM speed

c= 3×10⁸ m.s⁻¹

Dual nature of EMR wave model

Light is able to bend around corners through a process called diffraction

Dual nature of EMR particle model

Light is able to “knock” electrons out of a metal (called the photoelectric effect)

EM spectrum frequency increasing

From Radio - Gamma ray

EM spectrum Wavelength increasing

From Gamma ray - Radio

Due to the constant speed of EM waves

we can conclude that as the frequency of waves in the EM spectrum increases the wavelength decrease in an inverse proportion

The energy of a photon

is Directly proportional to the frequency of the wave(When the line is straight )

Energy is measured in

Joules (6,63×10⁻³⁴)

The energy of a photon

is inversely proportional to the wavelength of the wave ( when the line is curved )