Question

how many photons having wavelength 2000 A° are necessary to provide 1 joule of energy​

Answer 1

because " "E=(nhc)/(lambda)

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therefore n=(Exlambda)/(hc)

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=(1"Joule"xx5000xx10^(10)m)/(6.626xx10^(-34)"Joulesec"xx3xx10^(8)msec^(-1))

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=2.5xx10^(18)

photons

Answer 2

Explanation:

this is brainlist answer