Question

Solar radiation emitted by sun resembles that emitted by a black body at a temperature of 6000 K. Maximum intensity is emitted at a wavelength of about 4800Å. If the sun were to cool down from 6000 K to 3000 K then the peak intensity would occur at a wavelength

• A. 4800Å
• B. 9600Å
• C. 7200Å
• D. 6400Å

Answer 1

Answer: (B)

9600Å

Answer 2

$\lambda _ { m _ { 2 } } = \frac { \lambda _ { m _ { 1 } } T _ { 1 } } { T _ { 2 } } = \frac { 4800 \times 6000 } { 3000 }$=$9600 \AA$