Class 12 Physics · Chapter 3 · Test 2
Young's Double Slit
36 MCQs
34 questions · 30 min · 34 marks
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Sample questions
The first 5 of 34. Try each one, then tap to see the answer.
Question 1
Young's double slit experiment requires the two sources to be:
- ACoherent
- BIncoherent
- COf different wavelengths
- DOf different types
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Answer: A
The sources must be coherent with a constant phase difference and the same wavelength.
Question 2
At the point directly opposite the midpoint of the two slits the path difference is:
- Aλ
- Bλ/2
- CZero
- D2λ
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Answer: C
This point is equidistant from both slits so the path difference is zero and a bright fringe is formed.
Question 3
At the midpoint of the first dark fringe the path difference is:
- AZero
- Bλ
- C3λ/2
- Dλ/2
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Answer: D
A path difference of half a wavelength gives destructive interference.
Question 4
At the midpoint of the first dark fringe the phase difference between the two rays is:
- A180°
- B0°
- C90°
- D360°
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Answer: A
Half a wavelength path difference means the rays are in antiphase (180°).
Question 5
At the midpoint of the next bright fringe after the central one the path difference is:
- Aλ/2
- BOne whole wavelength λ
- C3λ/2
- DZero
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Answer: B
A path difference of λ puts the waves in phase giving constructive interference.
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