Recomendados
Mais conteúdo relacionado
Mais procurados
Mais procurados (20)
Destaque
Destaque (15)
Semelhante a E.m.waves
Semelhante a E.m.waves (20)
Mais de Physics Amal Sweis
Mais de Physics Amal Sweis (20)
Último
Último (20)
E.m.waves
- 1. Stopwatch Graph Home The EM Spectrum Lesson 01: Dispersion Lesson 02/03: The EM Spectrum Lesson 04: Pupil Research Lesson 05: Pupil Presentations
- 2. Stopwatch Graph Home Dispersion 06/01/16 Aim: • To be able to explain the cause of dispersion • To explain the nature of the electromagnetic spectrum Starter:
- 4. Stopwatch Graph Home Dispersion The white light ray is split into a spectrum of colours. This is known as DISPERSION. The different colours of light have different wavelengths. Different wavelengths are refracted different amounts. Red light is refracted least. Violet light is refracted the most. Which colour is refracted the most? How do you remember the order of the colours?Richard Of York Gave Battle In Vain
- 5. Stopwatch Graph Home Colour, Wavelength and Amplitude
- 6. Stopwatch Graph Home Dispersion Summary Red/violet Refracted more/less by glass Longer/shorter wavelength Red/violet Refracted more/less by glass Longer/shorter wavelength
- 7. Stopwatch Graph Home Definitions All Electromagnetic waves are energy waves They can travel through a vacuum They all travel at the speed of light (300 000 000 m/s) We group them by their properties and hence uses, inside each group is a range of frequencies. Copy
- 8. Stopwatch Graph Home Electromagnetic Spectrum Radio Micro Infra- Red Light Ultra- Violet Xrays Gamma Wavelength (λ) increases High frequency Short wavelength High energy Most penetrating High frequency Short wavelength High energy Most penetrating Low frequency Long wavelength Low energy Least penetrating Low frequency Long wavelength Low energy Least penetrating
- 9. Stopwatch Graph Home The EM Spectrum recap Aim: •To explain the dangers and uses of the EM Spectrum Light, a type of radiation, is part of the electromagnetic spectrum. The electromagnetic spectrum is made up of different types of radiation. The different types of radiation have different properties and behaviour. All electromagnetic waves can travel through space. All electromagnetic waves travel at the same speed in a vacuum [300,000,000 m/s]. TRUE/FALSE TRUE/FALSE TRUE/FALSE TRUE/FALSE TRUE/FALSE Starter:
- 10. Stopwatch Graph Home The Electromagnetic Spectrum 06/01/16 Aim: • To explain the uses and dangers of the EM Spectrum
- 11. Stopwatch Graph Home Electromagnetic Spectrum Radio Micro Infra- Red Light Ultra- Violet Xrays Gamma Wavelength (λ) increases Remember My Instructions Visible Under X – Ray Glasses High frequency Short wavelength High energy Most penetrating Low frequency Long wavelength Low energy Least penetrating
- 12. Stopwatch Graph Home Uses and dangers of EM radiation Copy the Top of the following table into your books (we will fill it in as we go) Radiation Uses Dangers Gamma X-rays Ultraviolet Light Infra red Microwaves Radio waves
- 14. Stopwatch Graph Home High Level nuclear waste Microbes can be killed using gamma radiation
- 15. Stopwatch Graph Home Increasing dose tumour view through the head skull healthy brain tissue Gamma rays can be used to treat brain tumours
- 16. Stopwatch Graph Home EM Radiation: Uses: Dangers: sterilising surgical equipment and food, killing cancer cells. High doses can kill cells. Lower does can cause cancer (brain, liver, bone, leukemia…) Sterility Gamma
- 18. Stopwatch Graph Home X-ray tube Jumbo jet wings are regularly checked in this way to see if any micro-cracks have developed. These small cracks are too small to see any other way and could have fatal consequences.
- 19. Stopwatch Graph Home X-ray tube Detection of broken bones in the body
- 20. Stopwatch Graph Home Customs X-Rays are used to scan luggage in customs Movie
- 21. Stopwatch Graph Home Damage to organs. X-rays can penetrate to the vital organs inside the body.
- 22. Stopwatch Graph Home EM Radiation: Uses: Dangers: Shadow pictures of luggage and inside the human body. High doses can kill cells. Lower doses can cause cancer Sterility X rays
- 24. Stopwatch Graph HomeMovie Friends
- 25. Stopwatch Graph Home Outer dead skin cells Outer dead skin cells Living skin cells Living skin cells The effect of UV on cells
- 26. Stopwatch Graph Home EM Radiation: Uses: Dangers: Sun beds, fluorescent lamps and security marking. Sun Burn. Skin cancer Blindness Ultraviolet
- 28. Stopwatch Graph Home Optical Fibres Optical fibres, that are used in communication, use total internal reflection. What are the applications of total internal reflection?
- 29. Stopwatch Graph Home EM Radiation: Uses: Dangers: Photography and endoscopes Blindness Light
- 31. Stopwatch Graph Home How do infrared waves cook food?
- 32. Stopwatch Graph Home Night vision All objects above absolute zero emit infrared radiation. The hotter an object is, the more heat radiation it emits. Some animals and cameras can detect infrared radiation and are able to build up a heat picture. Which are the hottest/coolest parts of the image shown? light is hot dark is cold Fireman Walking in the Woodland
- 33. Stopwatch Graph Home Uses of infrared – activity
- 34. Stopwatch Graph Home EM Radiation: Uses: Dangers: Remote controls, radiant heaters, grills, optical fibre communication, night vision, Mobile Phones Skin burns Infrared
- 36. Stopwatch Graph Home Microwave oven The microwaves have the exact wavelength (frequency) to be absorbed by the water molecules The molecules move faster The water temperature increases
- 37. Stopwatch Graph Home EM Radiation: Uses: Dangers: Satellite communication, mobile phones, cooking, RADAR. Internal tissue heating. Microwaves
- 39. Stopwatch Graph Home EM Radiation: Uses: Dangers: None is found Communication and astronomy. Radio waves
- 40. Stopwatch Graph Home The electromagnetic spectrum
- 41. Stopwatch Graph Home Energy of electromagnetic waves
- 42. Stopwatch Graph Home Effect of electromagnetic waves
- 44. Stopwatch Graph Home EM Questions 1) Match up the following parts of the electromagnetic spectrum with their uses : Gamma rays Allow us to see Radio waves Remote Controls Ultra Violet ‘See’ broken bones Visible Communications Microwaves RADAR X rays Sterilise equipment Infra Red Causes sun-tans
- 45. Stopwatch Graph Home EM Questions 2) Which radiations are missing from below? Gamma A Ultraviolet Light Infrared B Radio waves A. ___________ B. ___________ X rays Microwaves
- 46. Stopwatch Graph Home Electromagnetic Spectrum
Notas do Editor
- Teacher notes This three-part animation illustrations how food is cooked on a grill using infrared radiation. When viewing the animation, it should be stressed that heat is transferred though the meat by conduction
- Teacher notes This activity could be used as a plenary or revision exercise to check students’ understanding of the uses of infrared radiation. Students could be asked to write the answers in their books or on mini-whiteboards and the activity could be concluding by the completion on the IWB.
- Teacher notes This sequence, summarising the electromagnetic spectrum and the uses of the different types of electromagnetic waves, could be used as an introduction to the electromagnetic spectrum or as a plenary or revision exercise on the electromagnetic spectrum.
- Teacher notes This ordering activity could be used as a plenary or revision exercise on the energy of electromagnetic waves. Mini-whiteboards could be used to make this a whole-class exercise.
- Teacher notes This matching activity could be used as a plenary or revision exercise on electromagnetic waves and how they affect living tissues. Students could be asked to complete the questions in their books and the activity could be concluded by the completion on the IWB.
- Flash activity - drag the dark blue boxes to the appropriate grey box so that the spectrum is in the correct order by wavelength.