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Waves and Radiation Revision

Waves and Radiation Revision. Wave Parameters and Behaviours. v = f λ v = d ÷ t. crest. Wavelength. speed v. (metres m). amplitude A. (metres/second m/s). Axis. (metres m). Number of Waves passing a point per second is called the. The time for one wave is called the. trough.

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Waves and Radiation Revision

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  1. Waves and Radiation Revision Wave Parameters and Behaviours v = fλ v = d ÷ t crest Wavelength speed v (metres m) amplitude A (metres/second m/s) Axis (metres m) Number of Waves passing a point per second is called the The time for one wave is called the trough Frequency period Waves per Second – Hertz( Hz)

  2. Diffraction

  3. Qu 1

  4. Qu 2 Qu 3 steel

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  7. Electromagnetic Spectrum All electromagnetic waves travel at 300 000 000 ms-1 through a vacuum. (3 x 108 ms-1) and can travel through a vacuum. v = fλ Increasing wavelength Increasing frequency and energy

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  10. Light Angles always measured from the normal air glass Reflection Angle of incidence = angle of reflection Refraction – change of speed when going into a different material

  11. Convex lens Concave lens

  12. When the angle in the air gets to 90o it can no longer be refracted and is then reflected. This is called total internal reflection. total internal reflection. refraction Smaller than critical angle Critical angle – when refracted angle is 90o Larger than critical angle Optical fibre

  13. Qu 10 Open ended question Piggy in Lord of the Flies is short-sighted. Piggy's glasses are used to start bonfires. Discuss

  14. Qu 12 Qu 11

  15. 13.

  16. Nuclear Radiation Label the atom and give the charge of each :- proton neutron electron What is an ion? How can ionization happen?

  17. - Types of nuclear radiation • Alpha Particle (α) • Beta Particle (β) • Gamma Ray (γ) Which causes most ionisation? What is the most that each can penetrate?

  18. Sources of background radiation Natural Artificial

  19. . H = Dwr . Summary D = E÷ m H = H ÷ t .

  20. Half life – the time for the activity of the source to half. GBqgiga MBq mega kBq kilo mSvmilli µSv micro nSvnano Activity (MBq) Time (hours) What is the activity after 4 half lives?

  21. Splitting atom

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