[填空题]
The diameter of a spheritba: 2yvmg(+iwn4 )tso;bf4 brsgn 3v9mfu 73o(,hqpcal object is 3 $\times 10^{8} \mathrm{~cm}$ .
1. Write down the radius of the object.
The volume of the object can be expressed in the form $ \pi\left(a \times 10^{k}\right) \mathrm{cm}^{3} $ where $1 \leq a<10$ and k$ \in \mathbb{Z}$ . $\times 10^8$
2. Find the value of a and the value of k . a = k =
