For the helium gas, the yellow line has a wavelength of Question 8 options: a) about 492 nm and an energy of about 2.52 eV b) about 666 nm and an energy of about 1.86 eV c) about 471 nm and an energy of about 2.62 eV d) about 501 nm and an energy of about 2.47 eV e) about 587 nm and an energy of about 2.11 eV