First slide

Coherent sources and their importance in interference

Question

In Young's double slit experiment, the distance between sources is 1 mm and distance between the screen and source is 1 m. If the fringe width on the screen is 0.06 cm, then $λ$ =

Easy

A

$6000 Å$
B

$4000 Å$
C

$1200 Å$
D

$2400 Å$

Solution

$β = \frac{λD}{d} \Rightarrow (0 .06 \times 10^{- 2}) = \frac{λ \times 1}{1 \times 10^{- 3}} \Rightarrow λ = 6000 \overset{0}{A}$

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