. Neon gas is generally used in the signboards


If it emits strongly at 616nm calculate:

(a) The frequency of emission,

(b) the distance travelled by this radiation in 30 s (c)

(c) The energy of quantum and

(d) The number of quanta present if it produces 2 J of energy.

 

Best Answer

Explanation-

a. Wavelength(λ) emitted by neon gas=616nm =616 x 10-9 m

Frequency(ν)= c /λ

3x108 / 616×10-9 Where, C= 3x108

=4.87 x 1014 s-1

b. Distance travelled= s x t 

3x108 x 30= 9 x 109m

c. Energy=hν

6.626 x 10-34 x 4.87 x 1014 = 32.2 x 10-20 J

d. No. of quanta in 2J of energy= 2/ 32.2 x 10-20

=6.2 x 1018 

Final Answer-

Neon gas is generally used in the signboards. If it emits strongly at 616 nm

Calculate:

(a) The frequency of emission= 4.87 x 1014 s-1 

(b) Distance travelled by this radiation in 30 s= 9 x 109m

(c) The energy of quantum =32.2 x 10-20 J

(d) The number of quanta present, if it produces 2 J of energy=6.2 x 1018

 

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