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Light: number of photons problem
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00:08 Statement of problem
00:43 Convert from watts (W) to joules (J) of total energy
01:31 Convert wavelength (λ) from nanometers (nm) to meters (m)
02:19 Calculate frequency (ν) in s⁻¹
03:32 Use Planck's Law to find energy of single photon in joules (J)
05:06 Divide total energy by energy of single photon to find number of photons
Calculation of the number of photons emitted from a light bulb of known power, given the time that the bulb is lit, and the wavelength of the emitted photons.
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00:43 Convert from watts (W) to joules (J) of total energy
01:31 Convert wavelength (λ) from nanometers (nm) to meters (m)
02:19 Calculate frequency (ν) in s⁻¹
03:32 Use Planck's Law to find energy of single photon in joules (J)
05:06 Divide total energy by energy of single photon to find number of photons
Calculation of the number of photons emitted from a light bulb of known power, given the time that the bulb is lit, and the wavelength of the emitted photons.
Don't forget to like, comment, share, and subscribe!
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