A star with surface temperature 20,000K emits energy at a rate of 2.74x10 W. Calculate the peak-intensity wavelength and radius of the star. 

(a) 1.63x10 m, 1.25x10 m 

(b) 1.45x10 m, 1.55x10 m 

(c) 1.49x 10 m, 1.01x10 m 

(d) 1.59×10 m, 1.38x10 m