1.

A source S_1, is producing 10^(15) photons per second of wavelength 5000 Å. Another source S_(2) is producing 1.02xx10^(15) photons per second of wavelength 5100 Å. Then, (powerr of S_(2)) is equal to (power of S_(1))

Answer»

`1.04`
`0.98`
`1.00`
`1.02`

SOLUTION :If a SOURCE emits N photons per second of WAVELENGTH `lamda` then its power `P=n*(hc)/(lamda)`
`therefore (P_(2))/(P_(1))=(n_(1))/(n_(2))XX(lamda_(1))/(lamda_(2))=(1.02xx10^(15)xx(5000Å))/(10^(15)xx(5100Å))=1.00`


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