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1 markProperties of Waves

CAPE Physics Unit 1 · 2003 · Paper 2 · Question 7(b)(v)

Young's fringes were formed using monochromatic light and two slits with a separation of 0.55 mm. Twelve fringes occupying a distance of 16 mm were observed on a screen 1.3 m away.

What would be the effect on the fringes of gradually increasing the width of the single source slit?

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Other parts of this question

  1. 7(a)(i)State the conditions necessary to observe interference of light using TWO sources of light.[8 marks]
  2. 7(a)(ii)Describe a demonstration of Young's double slit inference.[1 mark]
  3. 7(a)(iii)State the formula for the fringe spacing and state the meaning of EACH of the terms used.[1 mark]
  4. 7(b)(i)Calculate the wavelength of the light used and state its colour.[12 marks]
  5. 7(b)(ii)State whether or not there would be a bright or dark fringe at the centre of the pattern and explain your answer.[1 mark]
  6. 7(b)(iii)Describe what would be seen if ONE slit were to be covered by an opaque material.[1 mark]
  7. 7(b)(iv)Describe the effect of replacing the monochromatic light source with one of white light when using BOTH slits.[1 mark]

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