Q. A particular star (assuming it as a black body) has a surface temperature of about $5 \times 10^{4}K$. The wavelength in nanometers at which its radiation becomes maximum is $(b = 0.0029\ mK)$

A) 48
B) 58
C) 60
D) 70
Explanation

(b) According to Wien’s displacement law
$\lambda_{m}T = b\ or\ \lambda_{m} = \frac{b}{T} = \frac{0.0029}{5 \times 10^{4}} = 58 \times 10^{- 9}m = 58nm$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.