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The wave function $R_{2,0}$ for hydrogen atom is $R_{2,0} = K\, (2 -r/a_0)$ exp $(-r/2a_0)$, where $K$ is constant. The distance $r$ at which $R_{2,0}$ exhibits nodel point is at :-

• A
  $a_0$
• ✓
  $2a_0$
• C
  $3a_0$
• D
  $4a_0$