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Q. White light is incident normally on a thin soap film (n = 1.33) suspended in air. What are the two least thicknesses that will constructively reflect yellow (l = 585 nm) light?

Q. A string 1.50 m long will break if the tension in it exceeds 2X10^2N. How fast (in m/s) can a rock of mass 1.50 kg be whirled in a circular horizontal path if the string is not to break? Assume the rock moves on a smooth horizontal surface (No friction).

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