What is the condition for constructive interference in a double-slit experiment?
Correct Answer: Path difference = nλ (n is an integer)
- Step 1: Understand that in a double-slit experiment, two waves are created from two slits.
- Step 2: Know that these waves travel different distances to reach a point on a screen.
- Step 3: The difference in distance traveled by the two waves is called the 'path difference.'
- Step 4: For constructive interference to happen, the path difference must be a whole number multiple of the wavelength.
- Step 5: This means the path difference can be 0, 1 wavelength, 2 wavelengths, etc. (nλ, where n is 0, 1, 2, 3, ...).
- Step 6: When this condition is met, the waves add together to make a brighter light on the screen.
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