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# Neon gas is generally used in the sign boards. If it emits strongly at 616 nm, calculate

2.47    Neon gas is generally used in the sign boards. If it emits strongly at 616 nm, calculate (d) number of quanta present if it produces 2 J of energy.

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If it produces 2J of energy then, the number of quanta present in it will be $'N'$.

Therefore,

$E=Nh\nu$  or  $N=\frac{E}{h\nu}$,

Where $E = 2J$ and $h\nu = 32.27\times10^{-20}J$   from the previous part.

$N=\frac{2J}{32.27\times10^{-20}J} = 6.2\times10^{18}$

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