# Problem: Heated lithium atoms emit photons of light with an energy of 2.961 × 10−19 J. Calculate the frequency and wavelength of one of these photons. What is the total energy in 1 mole of these photons? What is the color of the emitted light?

###### FREE Expert Solution

Color              wavelength, nm

Violet              380 – 450 nm

Blue                450 – 495 nm

Green             495 – 570 nm

Yellow                        570 – 590 nm

Orange           590 – 620 nm

Red                 620 – 750 nm

where:

h = Planck’s constant (6.626 × 10–34 J • s)

v = frequency (in s–1)

Solve for v:

80% (287 ratings) ###### Problem Details

Heated lithium atoms emit photons of light with an energy of 2.961 × 10−19 J. Calculate the frequency and wavelength of one of these photons. What is the total energy in 1 mole of these photons? What is the color of the emitted light?

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