C# Rocket Explode On Impact

Just do

 private void OnCollisionEnter(Collision collision)
 {
     // instantiate the explode particle here
     // OR if you want splash damage of some sort
     
     Health health = collision.collider.gameObject.GetComponent<Health>();
     if (health != null)
     {
           if (Vector3.Distance(collision.collider.gameObject, transform.position) < range)
          {
                 health.TakeDamage(damage);
          }
     }
 
     Destroy(gameObject);
 }