The graph between ψ 2 and r (radical distance) is shown below. This represents:

Question

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This graph shows one radial node
Formula of radial node $= n - l - 1$ ; angular node $= l$ ; total node $= n - 1$
$n =$ Principal quantum number
$l =$ Azimuthal quantum number

Radial nodes:

for $1 s$ $= n - l - 1 = 1 - 0 - 1 = 0$
for $2 s = 2 - 0 - 1 = 1$
for $2 p = 2 - 1 - 1 = 0$
for $3 s = 3 - 0 - 1 = 2$

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