Q. If the temperature of the sun becomes twice its present temperature, then
A) Radiated energy would be predominantly in infrared
B) Radiated energy would be predominantly in ultraviolet
C) Radiated energy would be predominantly in X-ray region
D) Radiated energy would become twice the present radiated energy
Explanation
(b) The wavelength corresponding to maximum emission of radiation from the sun is $\lambda_{\max} = 4753\mathring{\mathrm{A}}$ (close to the wavelength of violet colour of visible region). Hence if temperature is doubled $\lambda_{m}$ is decreased $\left( \lambda_{m} \propto \frac{1}{T} \right),\ i.e.,$ mostly ultraviolet radiations are emitted
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.