Calculate the wavelength of light emitted when the atom moves from the ground level to energy level A?

To calculate the wavelength of light emitted when an atom moves from the ground level to energy level A, we can use the formula:

λ = hc / ΔE

Where:
λ = wavelength of light emitted
h = Planck's constant (6.626 x 10^-34 J s)
c = speed of light (3.00 x 10^8 m/s)
ΔE = energy difference between the ground level and energy level A

Let's assume that the energy levels are given in joules. If the energy levels are given in electron volts (eV), you will need to convert them to joules by using the conversion factor 1 eV = 1.602 x 10^-19 J.

Once you have the energy difference between the ground level and energy level A in joules, you can plug it into the formula above to calculate the wavelength of light emitted.