# The external radius of the hollow sphere will be :

By melting two solid metallic spheres or radii 1 cm and 6 cm, a hollow sphere of thickness 1 cm is made. The external radius of the hollow sphere will be

- 6 cm
- 7 cm
- 8 cm
- 9 cm

By melting two solid metallic spheres or radii 1 cm and 6 cm, a hollow sphere of thickness 1 cm is made. The external radius of the hollow sphere will be

- 6 cm
- 7 cm
- 8 cm
- 9 cm