If a star is 300 light years from earth how long does it take light from the star to reach earth/12327655/b8099c19? utm_source=registration

The electron configuration for chromium is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 5 4 s 1 instead of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 4 4 s 1 . the configuration is an exception to the

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

How do i turn 2 s into one in the products