The black body spectrum of an object O(1...

The black body spectrum of an object `O_(1)` is such that its radiant intensity (i.e. intensity per unit wavelength interval) is maximum at a wavelength of 200 nm. Another object `O_(2)` has the maximum radiant intensity at 600 nm. The ratio of power emitted per unit area by source `O_(1)` to that of source `O_(2)` is

`1 : 81`

`1 : 9`

`9 : 1`

`81 : 1`

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