In the figure, projectile particle 1 is an alpha particle and target particle 2 is an oxygen nucleus. The alpha particle is scattered at angle $?_{1} = 70. 4^{?}$ and the oxygen nucleus recoils with speed $1.90 \times 1 0^{5} m / s$ and at angle $?_{2} = 48. 0^{?}$ . In atomic mass units, the mass of the alpha particle is $4.00 u$ and the mass of the oxygen nucleus is $16.0 u$ . What are the (a) final and (b) initial speeds of the alpha particle?

Question

In the figure, projectile particle 1 is an alpha particle and target particle 2 is an oxygen nucleus. The alpha particle is scattered at angle

?_{1} = 70. 4^{?}

and the oxygen nucleus recoils with speed

1.90 \times 1 0^{5} m / s

and at angle

?_{2} = 48. 0^{?}

. In atomic mass units, the mass of the alpha particle is

4.00 u

and the mass of the oxygen nucleus is

16.0 u

. What are the (a) final and (b) initial speeds of the alpha particle?

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