Quelpr
1 markProperties of Waves

CAPE Physics Unit 1 · 2005 · Paper 2 · Question 7(a)(i)

Derive the formula y = λD/a for interference of light waves from a double slit where y is the spacing of the fringes on a screen at a distance D from a double slit with spacing a and λ is the wavelength of the monochromatic light producing the interference pattern.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 7(a)(ii)Explain why the formula gives only an approximate value.[8 marks]
  2. 7(b)(i)Find the distances PX and QX from the speakers to the first maximum at X and hence find the wavelength of the sound waves.[1 mark]
  3. 7(b)(ii)What value does the formula y = λD/a give for the wavelength of the sound waves?[1 mark]
  4. 7(b)(iii)Discuss the fact that the values given in (b) (i) and (ii) are different.[1 mark]
  5. 7(b)(iv)What is the frequency of the sound from the speakers?[1 mark]
  6. 7(b)(v)The phase of speaker P is changed by 180°. What effect will this have on the sound heard at points O and X ?[12 marks]

More practice: the rest of this paper · more Properties of Waves questions · all CAPE Physics Unit 1 past papers