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What is the wavelength of a photon having energy 3 x 10-12 erg ?

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Formula of energy is- 

E = hc/λ

Hence, λ= hc/E

wavelength λ = hc/E = 6.626 x 10-27 erg s x 3.0 x 1010 cm s-1 / 3 x 10-12 erg = 6.626 x 10-5 cm

Since, 1 cm = 107 nm

Therefore the wavelength in nm = 6.626 x 10-5 x 10nm = 6.626 x 102 nm = 662.

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Sumit Saini

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