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Find the ratio of energy of a photon of ...

Find the ratio of energy of a photon of 2000`A^@` wavelength radiation to that of 4000`A^@` radiation.

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The correct Answer is:
2
`E= (hc)/(lambda) i.e , E prop 1/(lambda) therefore (E_1)/(E_2) = (lambda_2)/(lambda_1) = (4000)/(2000) = 2`
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