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Formulas:

X=λ*D/d

V=fλ

Speed of sound 340

Solution

By v=fλ,

λ=0.1m

then use X=λ*D/d

x=0.6m

However the answer key is 0.3m, and say that youngs double slit formula cannot be used. It's something like.

0.5△x=λD/a,which I don't really understand what it means...

Thank you!