Neon gas is generally used in 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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Solution

Energy of one photon (quantum) = $3.227 \times 10^{- 19} J$ {from part 3}
So, $3.227 \times 10^{- 19}$ J energy is present in 1 quantum.
Therefore, number of quanta is 2 J of energy = $\frac{2 J}{3.227 \times 10^{- 19}} J$
= $6.19 \times 10^{18} = 6.2 \times 10^{18}$

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Neon gas is generally used in the sign boards. If it emits strongly at 616 nm, calculate (a) the frequency of emission, (b) distance traveled by this radiation in 30 s (c) energy of quantum and (d) number of quanta present if it produces 2 J of energy

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