The Energy of Light Video Lessons

Concept: The Energy of Light

# Problem: In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850 nm. How many photons of infrared radiation does the lamp generate in 1.0 s? 1. 6.82 x 10 –14 photons 2. 1.04 x 10 29 photons 3. 6.63 x 10 23 photons 4. 1.10 x 10 –19 photons 5. 1.02 x 10 20 photons

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###### Problem Details

In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850 nm. How many photons of infrared radiation does the lamp generate in 1.0 s?

1. 6.82 x 10 –14 photons

2. 1.04 x 10 29 photons

3. 6.63 x 10 23 photons

4. 1.10 x 10 –19 photons

5. 1.02 x 10 20 photons

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Based on our data, we think this problem is relevant for Professor Holton's class at UCI.