MCQ
Three light sources $A, B$ and $C$ emit equal amount of radiant energy per unit time. The wavelengths emitted by the three sources are $450 \mathrm{~nm}, 555 \mathrm{~nm}$ and $700 nm$ respectively. The brightness sensed by an eye for thesources are $X_A X_B$ and $X_C$ respectively. Then,
- A$X_A>X_B, X_C>X_B$
- B$\mathrm{X}_{\mathrm{A}}>\mathrm{X}_{\mathrm{B}}, \mathrm{X}_{\mathrm{B}}>\mathrm{X}_{\mathrm{C}}$
- ✓$X_B>X_A, X_B>X_C$
- D$X_B>X_A, X_C>X_B$