Question

A black body emits radiations of maximum intensity for the wavelength of 5000 Å when the temperature of the body is 1227⁰C. If the temperature of the body is increased by 1000⁰C, the maximum intensity would be observed at –

• A. 1000Å
• B. 2000Å
• C. 5000 Å
• D. 3000Å

Answer 1

Answer: (D)

3000Å

Answer 2

l = $\frac{b}{t}$ ; $\frac{\lambda_{2}}{\lambda_{1}}$=$\frac{T_{1}}{T_{2}}$=$\frac{1500}{2500}$= $\frac{3}{5}$

l₂ = $\frac{3}{5}$ l₁ = 3000Å