(d) If A1 and A2 are the mass number of two parts. The radius of nucleus is given by ‌‌‌R=R0(A)1∕3 ‌ So, ‌‌‌R1=R0(A1)1∕3‌ and ‌R2=R0(A2)1∕3 ⇒‌‌‌
R1
R2
=(‌
A1
A2
)1∕3 ⇒‌‌‌
A1
A2
=(‌
R1
R2
)3=(‌
1
2
)3=‌
1
8
∴‌ Ratio of masses, ‌‌
m1
m2
=‌
A1
A2
=‌
1
8
‌ From conservation of momentum, ‌ ⇒‌‌m1v1=m2v2 ⇒‌‌‌