Question

according to the “emission spectra of some elements from stars”, which element has spectral lines in both red and blue portions of the visible spectrum? 1 hydrogen only 2 helium and oxygen 3 oxygen only 4 hydrogen, helium, and oxygen

Explanation:

To determine which element has spectral lines in both red and blue portions of the visible spectrum, we refer to the emission spectra of elements. Hydrogen, Helium, and Oxygen all have spectral lines in both the red and blue regions of the visible spectrum. Option 1 (Hydrogen only) is incorrect as other elements also have such lines. Option 2 (Helium and Oxygen) is incorrect as Hydrogen also has them. Option 3 (Oxygen only) is incorrect as Hydrogen and Helium also have them. Option 4 (Hydrogen, Helium, and Oxygen) is correct.

Answer:

1. Hydrogen, Helium, and Oxygen