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A bomb projected from ground at an angle...

A bomb projected from ground at an angle `theta(theta ne 90^(circ))` explodes into two fragments of equal mass at topmost point of its trajectory. If one of the fragments returns to the point of projection, then the ratio of de-Broglie wavelength of the second fragment just after explosion to that of bomb just before explosion is `(x)/(y)`. Find `(x+y)`.

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