An $\alpha$-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 $\frac{Wb}{m^2}$ . The de-Broglie wavelength associated with the particle will be

Question

( A ) 0.1 Å
( B ) 10Å
( C ) 0.01 Å
( D ) 1 Å