Luminosity of sun is 3.9xx10^(26) watts....

Luminosity of sun is `3.9xx10^(26)` watts. Mean distance of earth from the sun is `1.496xx10^(11)m`. What is the value of solar constant ?

`1.388xx10^(5)W`

`1.388xx10^(3)"W m"^(-2)`

`2.776xx10^(6)"W m"^(-2)`

`2.776xx10^(4)W`.

Text Solution

Verified by Experts

The correct Answer is:

Luminosity (E ) = Solor constant `xx4piR^(2)`
`:.` Solar const. `=(E)/(4piR^(2))=(3.9xx10^(26))/(4xx(22)/(7)xx(1.496xx10^(11))^(2))`
`=1.388xx10^(3)"watt/m"^(2)`.
Thus correct choice is (b).

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