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Describe how a moving image can be produced by a TV.(2)

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Name the three primary colours used in a colour TV?(1)

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What colours are produced by these combinations of light.
(a) Red + #FF8844
(b) Blue + #FF8844
(c) Red + Blue.(3)

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Which primary colours are mixed together to produce
(a) White
(b) Black.(2)

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Describe how a TV can produce orange light on the screen. (2)

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What is the speed of radio waves?(1)

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Calculate the distance travelled by a radio wave in 0.07 s.(2)

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A radio station broadcasts wavelengths of 252 m.
Calculate their frequency.(2)

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Explain why long wave radio waves are received better in a hilly area than short wave TV waves.(1)

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Why are curved dish aerials used to pick up satellite television signals?(2)

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Some torches use curved reflectors. Complete the diagram to show the path of the rays from the bulb.(2)

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Explain why some transmitter aerials have a curved reflector.(1)

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What is a geostationary satellite?(1)

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What happens to the period of a satellite's orbit as it moves closer to the Earth?(1)

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Why are satellites necessary for global communication when we already have radio waves?(1)

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