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Question 8

A physicist is optimizing a double-slit interference setup. In the initial setup (Setup 1), light of wavelength λ \lambda\,λ is incident on a double-slit of slit separation sss, and the interference pattern is observed on a screen at a distance DDD. The separation between adjacent bright fringes is 4.0 mm.

In the modified setup (Setup 2):

  • The light source is replaced with one of wavelength 0.75λ0.75\lambda0.75λ.
  • The screen distance is increased to 1.6D1.6D1.6D.
  • The double-slit is replaced with one having a slit separation of 0.80s.

What is the separation between adjacent bright fringes in Setup 2?

A

1.5 mm1.5\text{ mm}1.5 mm

B

3.8 mm3.8\text{ mm}3.8 mm

C

4.8 mm4.8\text{ mm}4.8 mm

D

6.0 mm6.0\text{ mm}6.0 mm

Markscheme

Waves Questions

  1. A Level
  2. /Physics
  3. /Waves

26 exam-style questions on OCR A A Level Physics Waves, covering Wave motion, Electromagnetic waves, Superposition, and Stationary waves. Each one has a worked solution and a mark scheme showing where the marks go.

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