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

NCERT Exercise Problem Page No. 71 Structure of Atom
Problem 2.47. Neon gas is generally used in the sign boards. If it emits strongly at 616 nm, calculate (a) the frequency of emission, (b) distance travelled by this radiation in 30s (c) energy of quantum and (d) number of quanta present if it produces 2J of energy.

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