In a helium-neon laser the emissions occur from transitions between two excited states in neon, one being at 20.66 eV above the ground state and the other being 18.70 eV above ground. What is the energy of the photons emitted by this laser?
A)
20.66 eV
B)
1.96 eV
C)
18.70 eV
D)
19.60 eV
E)
39.36 eV
B
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Explain what an interferometer is and give an example
What will be an ideal response?
A pair of narrow slits, separated by 1.8 mm, is illuminated by a monochromatic light source. Light waves arrive at the two slits in phase,
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