Question

Certain substance emits only the wavelengths $\lambda_{1},\lambda_{2},\lambda_{3}$ and $\lambda_{4}$when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelengths

• A. $\lambda_{1}$
• B. $\lambda_{2}$
• C. $\lambda_{1}$and$\lambda_{2}$
• D. $\lambda_{1},\lambda_{2},\lambda_{3}$ and $\lambda_{4}$

Answer 1

Answer: (D)

$\lambda_{1},\lambda_{2},\lambda_{3}$ and $\lambda_{4}$

Answer 2

If a body emits wavelength λ₁, λ₂, λ₃ and λ₄ at a high temperature then at a lower temperature it will absorbs the radiation of same wavelength. This is in accordance with Kirchoff's law.