a) Name the colors of visible light (the colors of the rainbow) in order of increasing energy. Indicate the approximate wavelength associated with each color.

b) When excited, elemental sodium gives off a distinctive color that is used often in street lighting. What is the predominant wavelength associated with the emission of atomic sodium?

b. Yellow

a. start with red, end with violet.

a) To name the colors of visible light (the colors of the rainbow) in order of increasing energy and indicate the approximate wavelength associated with each color, we can refer to the electromagnetic spectrum.

The colors of visible light, from lowest to highest energy, are:

1. Red: With a wavelength of approximately 700-635 nanometers, red light has the lowest energy among visible light.
2. Orange: The approximate wavelength of orange light is 635-590 nanometers.
3. Yellow: Yellow light has a wavelength range of approximately 590-565 nanometers.
4. Green: The wavelength of green light spans from approximately 565-500 nanometers.
5. Blue: Blue light has a wavelength range of approximately 500-450 nanometers.
6. Indigo: The approximate wavelength of indigo light is 450-420 nanometers.
7. Violet: With the highest energy among visible light, violet light has a wavelength of approximately 420-380 nanometers.

b) Elemental sodium, when excited, emits a specific color that is commonly used in street lighting. The predominant wavelength associated with the emission of atomic sodium is approximately 589.3 nanometers.