Q16.In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20m. The separation between P and Q is 5m and the phase of P is ahead of that of Q by 90°. A, B and C are three distinct point of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio : (1) 0 : 1 : 4 (2) 2 : 1 : 0 (3) 0 : 1 : 2 (4) 4 : 1 : 0
What This Question Tests
This question tests the understanding of interference from two coherent sources with an initial phase difference, requiring calculation of path differences and resulting phase differences at specific observation points to determine intensities. The phrase 'equidistant from the midpoint of PQ' implies specific points P, Q, and the midpoint M.
Concepts Tested
Formulas Used
Δφ = (2π/λ)Δx + Δφ_initial
I = I₁ + I₂ + 2√(I₁I₂)cos(Δφ)
📚 NCERT Sections This Tests
10.5 — In Young’S Double-Slit Experiment Using Monochromatic Light Of
Physics Class 12 · Chapter 10
10.5 In Young’s double-slit experiment using monochromatic light of wavelength l, the intensity of light at a point on the screen where path difference is l, is K units. What is the intensity of light at a point where path difference is l/3?
10.4 — In A Young’S Double-Slit Experiment, The Slits Are Separated By
Physics Class 12 · Chapter 10
10.4 In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.
10.2 — What Is The Shape Of The Wavefront In Each Of The Following Cases:
Physics Class 12 · Chapter 10
10.2 What is the shape of the wavefront in each of the following cases: (a) Light diverging from a point source. (b) Light emerging out of a convex lens when a point source is placed at its focus. (c) The portion of the wavefront of light from a distant star intercepted by the Earth.
📋 Question Details
- Chapter
- Wave Optics
- Topic
- Interference of waves
- Year
- 2020
- Shift
- 06 Sep Shift 1
- Q Number
- Q16
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 10: Wave Optics
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