# Calculate number of photons with a wavelength of 3000pm that provides 1 Joule of energy.

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Photon energy = h n where h = plank's constant and n is frequency

let there be N photons..

Wave length = c / n where c is velocity of light

= 3000 * 10^-12 m

* 1 joule = N h c / n => N = 1 * n / (h * c)*

N = 1 * 3000 * 10^-12 / (3 * 10^8 * 6.626 * 10^ -34 ) = 10^17 / 6.626 = 1.509 * 10^16

let there be N photons..

Wave length = c / n where c is velocity of light

= 3000 * 10^-12 m

N = 1 * 3000 * 10^-12 / (3 * 10^8 * 6.626 * 10^ -34 ) = 10^17 / 6.626 = 1.509 * 10^16