Green.
You think probable to the wavelength.
around 640 nanometers
When the wavelength decreases, that's known as a "blue shift", becausethe color of any visible light shifts toward the blue end of the spectrum.That phenomenon is associated with a light source that's moving TOWARDthe observer.
no
500 nanometers long waves fit along a 2 centimeters line
You think probable to the wavelength.
178.334kJ/mol.
around 640 nanometers
A spectral line
A spectral line that appears at a wavelength of 321 nm in the laboratory appears at a wavelength of 328 nm in the spectrum of a distant object. We say that the object's spectrum is red shifted.
Barium has an atomic spectra of lines, not only one line (with one wavelength); I reccomend to consult a catalog of spectral lines. See the link below.
That is the "gamma" line of the Lyman series: 94.97 nanometers.
yellow 1
Since the K is 1 level below the L, only one photon (at 1 specific wavelength) will emit. So you will only see 1 spectral line.
When the wavelength decreases, that's known as a "blue shift", becausethe color of any visible light shifts toward the blue end of the spectrum.That phenomenon is associated with a light source that's moving TOWARDthe observer.
no
In general it can be called a single frequency or a single wavelength. In the infrared, visible, and ultraviolet bands it can be called a spectral line. In the visible band it can be called monochromatic.