Question

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

Answer 1

Answer: (B)

Radiated energy would be predominantly in ultraviolet

Answer 2

The wavelength corresponding to maximum emission of radiation from the sun is $\lambda _ { \max } = 4753 \AA$ (close to the wavelength of violet colour of visible region). Hence if temperature is doubled λ_m is decreased $\left( \lambda _ { m } \propto \frac { 1 } { T } \right)$ i.e. mostly ultraviolet radiations emits.