6.6 electromagnetic waves
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Transcript of 6.6 electromagnetic waves
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6.6 Electromagnetic Waves
April 8, 2023
Think about:• How well behaved you are• How good you are at science• How much you like chocolate hob
nobs
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Aims
• Describe visible light as part of the electromagnetic spectrum
• State other types of radiation
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Electromagnetic waves
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Travel through empty space
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Travel at 300 000 km/s
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Transverse waves
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They transfer energy
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Light vs Sound
Example of wave LIGHT SOUNDType of wave
Speed in air / km/s
Material of medium
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Light vs Sound
Example of wave LIGHT SOUNDType of wave Transverse Longitudinal
Speed in air / km/s
300 000 340
Material of medium
No material required
Solid, liquid, gas
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Example of wave LIGHT SOUNDType of wave
Speed in air / km/s
Material of medium
Example of wave LIGHT SOUNDType of wave
Speed in air / km/s
Material of medium
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Electromagnetic radiation actually comes in packets
or lumps. I call these packets ‘quanta’. A quanta of light is called a photon.
Nobel prize please…
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The higher the frequency, the more energy the photon has
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Intensity
Energy of each photonNumber of photons arriving each second
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The electromagnetic spectrum
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Radio waves
Accelerated electrons
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Radiowaves
• Communications: TV, mobile phones, local radio, police
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Microwaves
Molecular transitions
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Microwaves
• Microwaves ovens, communicating with satellites, RADAR
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Infrared
Molecular transitions
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Infra-red
• Search and rescue teams, detect circulation problems, (cancer, arthritis), astronomy, burglar alarms
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Light
Atomic transitions and electron acceleration
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Ultraviolet
Atomic transitions
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UV
• Produce vitamin D in our skin, suntan, skin cancer
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X-rays
Electron transitions and collisions
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X-rays
• X-rays (bones, teeth), check welds and joints, food
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Gamma rays
Nuclei transitions and annihilation
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Gamma rays
• Make Hulks, sterilise food and utensils, tracers, radiotherapy
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RECALL THE DETRIMENTAL EFFECTS OF EXCESSIVE EXPOSURE OF THE HUMAN BODY TO ELECTROMAGNETIC WAVES
3.13
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Make an EM spectrum booklet
Guest starring Mr. Simon Porter
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The EM spectrum
• You now have seven sections to fill in with information regarding the seven types of electromagnetic radiation
• Include uses, dangers, detectors, examples and origins if you can
• The better you make it the better it will help your revision