MCQ
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 ${\lambda _2}$
- ✓${\lambda _1},\;{\lambda _2},\;{\lambda _3}$ and ${\lambda _4}$
