The Attempt at a Solution
This is an example given in the book . But I am just wondering whether the question itself is correct .
How can intensity of light emitted from Sun is given a constant ? Shouldn't 1400 be the power emitted from Sun ?
If 1400 is power emitted from sun , then in part b) , n = 1400/E . We don't need radius of earth to answer part b) .
Instead we would require radius of orbit of earth to answer part a) .
This is different from what is done in the book .
Could the experts kindly let me know whether my objection is valid or not ?