Neon gas is generally used in the sign boards. If it emits strongly at

1.	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 in it produces 2 J of energy.
Answer» (a) λ = 6 nm = 6 x 10^-9 m Frequency, v = C/λ = {3 x 10⁸ m/sec}/{616 x 10^-9} m = 4.87 x 10^-14 s^-1 (b) Distance travelled by the radiation in 30 s = 3 x 10⁸ m/sec x 30 sec = 9.0 x 10⁹ m (c) E = hv = 6.626 x 10^-34 Js x 4.87 x 10¹⁴ = 32.27 x 10^-20 J (d) Number of quanta present = 6.2 x 10¹⁸

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 in it produces 2 J of energy.

Answer»

(a) λ = 6 nm = 6 x 10^-9 m

Frequency, v = C/λ = {3 x 10⁸ m/sec}/{616 x 10^-9} m

= 4.87 x 10^-14 s^-1

(b) Distance travelled by the radiation in 30 s

= 3 x 10⁸ m/sec x 30 sec

= 9.0 x 10⁹ m

= 6.626 x 10^-34 Js x 4.87 x 10¹⁴

= 32.27 x 10^-20 J

(d) Number of quanta present = 6.2 x 10¹⁸