Question

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
30 s (c) energy of quantum and (d) number of quanta present if it produces 2 J of
energy​

Answer 1

Answer:

(a) The frequency of emission is c/A= 3.0x10⁸/616x10-⁹=4.87x10¹⁴.

(b)The distance travelled in 30 s is

d=t×λ×ν

=30×616×10-⁹x4.87x10¹⁴=9.0x10⁹m

(c) The energy of quanta is E=hν=6.626×10-³⁴ x4.87x10¹⁴=3.227x10-¹⁹J

(dThe number of quanta in 2J of energy is 2/3.227x10-¹⁹=10¹⁸photons.

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