=0.31×10−6m=310‌nm As, λ≤λ‌th ‌   S→1 (2) 400<λ<700‌nm R→2 (3) Central maxima is widest for maximum wavelength ⇒‌‌P→3 (4) σA(T1)4=‌
1
16
σAT24⇒T1=‌
1
2
T2=3000K‌‌Q→4 (5) For imaging bones X-rays are used (1−10‌nm) None of the options in List-II