2.
已知\(f(n)=1+ \dfrac {1}{ \sqrt {2}}+ \dfrac {1}{ \sqrt {3}}+…+ \dfrac {1}{ \sqrt {n}}(n∈N^{*})\),\(g(n)=2( \sqrt {n+1}-1)(n∈N^{*})\).
\((1)\)当\(n=1\),\(2\),\(3\)时,分别比较\(f(n)\)与\(g(n)\)的大小\((\)直接给出结论\()\);
\((2)\)由\((1)\)猜想\(f(n)\)与\(g(n)\)的大小关系,并证明你的结论.