Question

In Rutherford experiment the number of alpha particles scattered through an angle of ${90}^{\circ }$ in 28 per minute. Find the number particles scattered through an angle of ${60}^{\circ }$ per minute.

Answer 1

at ${90}^{c}irc=28=$ per minute
$1^{\circ }=\frac{28}{90}=$ per minute
${60}^{\circ }=\frac{28}{\text{/}{90}_3}\times \text{/}{60}^2=\frac{56}{3}=$ per minute
$=18.6$