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Question 12

Two coherent light waves of the same frequency travel to a detector. At the detector, wave 1 has an amplitude of A0 A_0\,A0​ and an intensity of I0I_0I0​. Wave 2 has an amplitude of 0.3A00.3A_00.3A0​. The path difference between the waves at the detector is 1.5λ1.5\lambda1.5λ, where λ \lambda\,λ is the wavelength of the waves.

What is the resultant intensity at the detector in terms of I0I_0I0​?

A

0.49I00.49 I_00.49I0​

B

0.70I00.70 I_00.70I0​

C

1.09I01.09 I_01.09I0​

D

1.69I01.69 I_01.69I0​

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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