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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

A helium-neon laser is pumped by electric discharge. What wavelength electromagnetic radiation would be needed to pump it? See Figure 30.39 for energy-level information.

To determine

The wavelength of electromagnetic radiation that would be needed to pump when a helium-neon laser is pumped by electric discharge

Explanation

Given Data:

Given below the figure showing energy-level information. A helium-neon laser is pumped by electric discharge.

  

Formula Used:

Energy is given as

  E=hcλ

Where, E= Energy

  h= Planck's constant

  c= Speed of light

  λ= Wavelength

Calculation:

We have h=6.626×1034J.s , E=20.66eV

  c=3×108m/sec

Substituting the values in equation of energy, we have

  E=hcλ

  20.66eV=(6.626× 10 34J.s)(3× 108m/sec)λ

  λ=(6.626× 10 34J

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