# Neon gas is gener

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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