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A alpha -parhticle moves in a circular ...

A `alpha` -parhticle moves in a circular path of radius `0.83 cm` in the presence of a magnetic field of `0.25 Wb//m^(2)`. The de-Broglie wavelength assocaiated with the particle will be

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`lambda = (h)/(p) = (h)/(qBr) = (6.62 xx 10^(-34))/(2 xx 1.6 xx 10^(-19) xx 0.25 xx 83 xx 10^(-4))` meter `= 0.01 Å [:' (mv^(2))/(r) = qvB]`
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