Q. 474.3( 12 Votes )

Neon gas is gener

Answer :

Given:

Wavelength, λ = 616 nm = 616× 10-9m

a)

To find frequency:


Speed of Light = [Frequency] × [Wavelength]


We know speed of light = 3×108 m/s


Frequency, v = [3×108] / [616 × 10-9]


v = 4.87×1014 Hz

b)

To find distance travelled:


Velocity of the radiation = 3× 108 m/s


Therefore, distance travelled in 30s = 30× 3× 108 = 9.0× 109m


To find the energy:


By Planck’s relation we have,


Energy, E = h×v


= [6.626×10-34] × [4.87×1014]


= 3.23×10-19 J

= 2 ev.


Therefore, the energy of the photon corresponding to light of frequency 4.87×1014 Hz is 3.23×10-19 J.

d)
  Number of photons or quanta = 

                               = 

                               =6.239 × 1018.

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