Some Properties of Matter. Грекова О.А. - 16 стр.

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          IV Writing:

1. Write the sentences in right order:
    1. Before Newton it was believed that white light was simple.
    2. On a clear sunny day you can see an artificial rainbow.
    3. Newton showed that white light was the complicated thing.
    4. The colours of the rainbow are due to the different refraction of the different colours.
    5. Most colours that occur in nature are not pure spectral colours.
    6. If we mix yellow and blue paint, we get a green paint, because the yellow is not a pure
     spectral colour.
    7. Complementary colours can be produced by the addition of two spectral colours.
    8. Ordinary colours are called subtraction colours.
    9. If we throw a yellow beam and a blue beam of light so as to overlap on
       a piece of white paper we get a true addition colour.
2. Give a short summery of the text.

                                              Unit7

   I Pre-reading task:

            1. Check up the meaning of the following words:
Verbs: detect, convey, pump out, hang up, vibrate backwards and forwards, pass through, note,
reflect, detect, judge, register.
Nouns: wave, bell, ticking, vessel, particle, sight, lightning, thunder, reflection, cliff-face,
wavelength, echo [          ], source, depth, shoal of fish, submarines [         ], apparatus,
frequency.
Adj: huge, glass, longitudinal, blank, flat, sharp, dry, satisfactory.
Adv: completely, precisely.

II Grammar:
                                    Present Perfect (Active/Passive)
Active;( have/has + V.3)
Use: a) expresses an action in the past – the experience as a part of someone’s life.
          e) ~ an action or state which began in the past and continues to the present.
Passive:(has/have + been + V.3)
Use: The rules for tense usage in the passive are the same as in the active.
The Americans have made Diet Coke since 1982. (Active)
Diet Coke has been made since 1982 (Passive)

III Reading:

   1. Read the text and find out the examples of Pr. Perfect (passive forms).

                                                Sound

             Sound, as detected by the ear, is the result of a wave passing through the air.
Light travels in completely empty space, which can carry electromagnetic forces, but sound