Final answer:
To find the energy level E2 of a neon atom in a helium-neon laser, use the energy formula E = hc/λ with the provided values, obtaining approximately 2.284 eV.
Step-by-step explanation:
The student has asked about the energy of a specific energy level (E2) in a neon atom within a helium-neon laser setup. To calculate the energy E2, we can use the given wavelength of the green light produced (543 nm) and the energy formula given by E = hc/λ, where h is Planck's constant, c is the speed of light in a vacuum, and λ is the wavelength of the emitted light. With hc provided as 1240 nm eV, we can find the energy in electronvolts (eV).
First, we convert the wavelength from nanometers to meters:
543 nm = 543 x 10-9 meters
Next, we compute the energy E2 using the formula:
E2 = hc/λ
E2 = (1240 eV nm) / (543 nm)
E2 = 2.284 eV (approximately)
Therefore, the energy level E2 is approximately 2.284 eV.