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How many photons of light having a wavelength of 4000Å are necessary to provide 1J of energy ? (h= 6.63 xx 10^(-34)J.s, c=3 xx 10^(8)m//s) |
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Answer» Solution :Energy of a photon = `hv= (hc)/(lamda)` `=((6.63 XX 10^(-34)J.s) (3XX 10^(8) m//s))/((4000 xx 10^(-10)m))` `=4.97 xx 10^(-19)J` `therefore` number of PHOTONS required `= (1J)/(4.97 xx 10^(-19)J)` `=2.01 xx 10^(18)` |
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