Three Young’s double-slit arrangements use the following parameters: • Setup P: , , •…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Three Young’s double-slit arrangements use the following parameters: • Setup P:

λ = 500\,\text{nm}

d = 0.25\,\text{mm}

D = 1.0\,\text{m}

• Setup Q:

λ = 650\,\text{nm}

d = 0.35\,\text{mm}

D = 1.2\,\text{m}

• Setup R:

λ = 450\,\text{nm}

d = 0.20\,\text{mm}

D = 0.8\,\text{m}

Arrange the setups in decreasing order of fringe width. (a)

R>P>Q

(b)

Q>R>P

(c)

Q>P>R

(d)

P>R>Q